diff --git a/src/Adder/DiscountAdjustmentsAdder.php b/src/Adder/DiscountAdjustmentsAdder.php
new file mode 100644
index 0000000..e4d2aa8
--- /dev/null
+++ b/src/Adder/DiscountAdjustmentsAdder.php
@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Setono\SyliusOrderEditPlugin\Adder;
+
+use Sylius\Component\Core\Distributor\IntegerDistributorInterface;
+use Sylius\Component\Core\Model\AdjustmentInterface;
+use Sylius\Component\Core\Model\OrderItemInterface;
+use Sylius\Component\Core\Model\OrderItemUnitInterface;
+use Sylius\Component\Order\Factory\AdjustmentFactoryInterface;
+
+final class DiscountAdjustmentsAdder implements DiscountAdjustmentsAdderInterface
+{
+    public function __construct(
+        private readonly IntegerDistributorInterface $integerDistributor,
+        private readonly AdjustmentFactoryInterface $adjustmentFactory,
+    ) {
+    }
+
+    public function add(
+        OrderItemInterface $orderItem,
+        string $adjustmentType,
+        string $originCode,
+        string $label,
+        int $discount,
+    ): void {
+        $discounts = $this->integerDistributor->distribute($discount, $orderItem->getQuantity());
+        $units = $orderItem->getUnits();
+
+        /** @var int $discount */
+        foreach ($discounts as $i => $discount) {
+            /** @var AdjustmentInterface $adjustment */
+            $adjustment = $this->adjustmentFactory->createWithData(
+                $adjustmentType,
+                $label,
+                $discount,
+            );
+            $adjustment->setOriginCode($originCode);
+
+            /** @var OrderItemUnitInterface $unit */
+            $unit = $units->get($i);
+            $unit->addAdjustment($adjustment);
+        }
+    }
+}
diff --git a/src/Adder/DiscountAdjustmentsAdderInterface.php b/src/Adder/DiscountAdjustmentsAdderInterface.php
new file mode 100644
index 0000000..ea3a401
--- /dev/null
+++ b/src/Adder/DiscountAdjustmentsAdderInterface.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Setono\SyliusOrderEditPlugin\Adder;
+
+use Sylius\Component\Core\Model\OrderItemInterface;
+
+interface DiscountAdjustmentsAdderInterface
+{
+    public function add(
+        OrderItemInterface $orderItem,
+        string $adjustmentType,
+        string $originCode,
+        string $label,
+        int $discount,
+    ): void;
+}
diff --git a/src/Form/Type/CustomDiscountCollectionType.php b/src/Form/Type/CustomDiscountCollectionType.php
index fbe183a..9f54a06 100644
--- a/src/Form/Type/CustomDiscountCollectionType.php
+++ b/src/Form/Type/CustomDiscountCollectionType.php
@@ -4,12 +4,16 @@
 
 namespace Setono\SyliusOrderEditPlugin\Form\Type;
 
+use Doctrine\Common\Collections\Collection;
+use Sylius\Component\Core\Model\OrderInterface;
+use Sylius\Component\Core\Model\OrderItemInterface;
 use Sylius\Component\Order\Factory\AdjustmentFactoryInterface;
 use Sylius\Component\Order\Model\AdjustableInterface;
 use Sylius\Component\Order\Model\AdjustmentInterface;
 use Symfony\Component\Form\AbstractType;
 use Symfony\Component\Form\Extension\Core\Type\CollectionType;
 use Symfony\Component\OptionsResolver\OptionsResolver;
+use Webmozart\Assert\Assert;
 
 abstract class CustomDiscountCollectionType extends AbstractType
 {
@@ -36,26 +40,35 @@ public function configureOptions(OptionsResolver $resolver): void
             'entry_options' => [
                 'label' => false,
             ],
-            'getter' => function (AdjustableInterface &$adjustable): array {
-                $adjustments = $adjustable->getAdjustments($this->adjustmentType)->toArray();
+            'getter' =>
+                /** @param OrderItemInterface|OrderInterface $adjustable */
+                function (AdjustableInterface &$adjustable): array {
+                    Assert::isInstanceOfAny($adjustable, [OrderInterface::class, OrderItemInterface::class]);
+                    /** @var Collection $adjustments */
+                    $adjustments = $adjustable->getAdjustmentsRecursively($this->adjustmentType);
 
-                return array_map(function (AdjustmentInterface $adjustment): int {
-                    return -1 * $adjustment->getAmount();
-                }, $adjustments);
-            },
+                    $notDistributedAdjustments = [];
+                    /** @var AdjustmentInterface $adjustment */
+                    foreach ($adjustments as $adjustment) {
+                        /** @var string $originCode */
+                        $originCode = $adjustment->getOriginCode();
+
+                        if (isset($notDistributedAdjustments[$originCode])) {
+                            $notDistributedAdjustments[$originCode] += ($adjustment->getAmount()) * -1;
+
+                            continue;
+                        }
+
+                        $notDistributedAdjustments[$originCode] = ($adjustment->getAmount()) * -1;
+                    }
+
+                    return $notDistributedAdjustments;
+                },
             'setter' => function (AdjustableInterface &$adjustable, array $discounts): void {
-                $adjustable->removeAdjustments($this->adjustmentType);
-
-                /** @var int $discount */
-                foreach ($discounts as $discount) {
-                    $adjustment = $this->adjustmentFactory->createWithData(
-                        $this->adjustmentType,
-                        $this->label,
-                        -1 * $discount,
-                    );
-                    $adjustable->addAdjustment($adjustment);
-                }
+                $this->setDiscounts($adjustable, $discounts);
             },
         ]);
     }
+
+    abstract public function setDiscounts(AdjustableInterface $adjustable, array $discounts): void;
 }
diff --git a/src/Form/Type/OrderDiscountCollectionType.php b/src/Form/Type/OrderDiscountCollectionType.php
index 61ed3b8..5412234 100644
--- a/src/Form/Type/OrderDiscountCollectionType.php
+++ b/src/Form/Type/OrderDiscountCollectionType.php
@@ -5,12 +5,30 @@
 namespace Setono\SyliusOrderEditPlugin\Form\Type;
 
 use Setono\SyliusOrderEditPlugin\Model\AdjustmentTypes;
+use Setono\SyliusOrderEditPlugin\Setter\OrderDiscountAdjustmentSetterInterface;
+use Sylius\Component\Core\Model\OrderInterface;
 use Sylius\Component\Order\Factory\AdjustmentFactoryInterface;
+use Sylius\Component\Order\Model\AdjustableInterface;
+use Webmozart\Assert\Assert;
 
 final class OrderDiscountCollectionType extends CustomDiscountCollectionType
 {
-    public function __construct(AdjustmentFactoryInterface $adjustmentFactory)
-    {
+    public function __construct(
+        AdjustmentFactoryInterface $adjustmentFactory,
+        private readonly OrderDiscountAdjustmentSetterInterface $orderDiscountAdjustmentSetter,
+    ) {
         parent::__construct($adjustmentFactory, 'Custom discount', AdjustmentTypes::SETONO_ADMIN_ORDER_DISCOUNT);
     }
+
+    public function setDiscounts(AdjustableInterface $adjustable, array $discounts): void
+    {
+        Assert::isInstanceOf($adjustable, OrderInterface::class);
+
+        $adjustable->removeAdjustmentsRecursively($this->adjustmentType);
+
+        /** @var int $discount */
+        foreach ($discounts as $discount) {
+            $this->orderDiscountAdjustmentSetter->set($adjustable, $discount);
+        }
+    }
 }
diff --git a/src/Form/Type/OrderItemDiscountCollectionType.php b/src/Form/Type/OrderItemDiscountCollectionType.php
index a6ef476..9b49205 100644
--- a/src/Form/Type/OrderItemDiscountCollectionType.php
+++ b/src/Form/Type/OrderItemDiscountCollectionType.php
@@ -4,13 +4,40 @@
 
 namespace Setono\SyliusOrderEditPlugin\Form\Type;
 
+use Setono\SyliusOrderEditPlugin\Adder\DiscountAdjustmentsAdderInterface;
 use Setono\SyliusOrderEditPlugin\Model\AdjustmentTypes;
+use Sylius\Component\Core\Model\OrderItemInterface;
 use Sylius\Component\Order\Factory\AdjustmentFactoryInterface;
+use Sylius\Component\Order\Model\AdjustableInterface;
+use Webmozart\Assert\Assert;
 
 final class OrderItemDiscountCollectionType extends CustomDiscountCollectionType
 {
-    public function __construct(AdjustmentFactoryInterface $adjustmentFactory)
-    {
+    public function __construct(
+        AdjustmentFactoryInterface $adjustmentFactory,
+        private readonly DiscountAdjustmentsAdderInterface $discountAdjustmentsAdder,
+    ) {
         parent::__construct($adjustmentFactory, 'Custom item discount', AdjustmentTypes::SETONO_ADMIN_ORDER_ITEM_DISCOUNT);
     }
+
+    /** @psalm-ignore-var $adjustable */
+    public function setDiscounts(AdjustableInterface $adjustable, array $discounts): void
+    {
+        Assert::isInstanceOf($adjustable, OrderItemInterface::class);
+
+        $adjustable->removeAdjustmentsRecursively($this->adjustmentType);
+        /** @var int $orderItemId */
+        $orderItemId = $adjustable->getId();
+
+        /** @var int $discount */
+        foreach ($discounts as $discount) {
+            $this->discountAdjustmentsAdder->add(
+                $adjustable,
+                $this->adjustmentType,
+                $this->adjustmentType . '_' . $orderItemId,
+                'Custom item discount',
+                -$discount,
+            );
+        }
+    }
 }
diff --git a/src/Resources/config/services/form.xml b/src/Resources/config/services/form.xml
index 460feea..f43a7d8 100644
--- a/src/Resources/config/services/form.xml
+++ b/src/Resources/config/services/form.xml
@@ -3,12 +3,13 @@
            xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">
     <services>
         <!-- Form types -->
-        <service id="setono_sylius_order_edit.form.type.order_item"
-                 class="Setono\SyliusOrderEditPlugin\Form\Type\OrderItemType">
+        <service
+            id="setono_sylius_order_edit.form.type.order_item"
+            class="Setono\SyliusOrderEditPlugin\Form\Type\OrderItemType"
+        >
             <argument type="service" id="sylius.order_item_quantity_modifier"/>
             <argument>%sylius.model.order_item.class%</argument>
             <argument>%sylius.form.type.order_item.validation_groups%</argument>
-
             <tag name="form.type"/>
         </service>
 
@@ -17,6 +18,7 @@
             class="Setono\SyliusOrderEditPlugin\Form\Type\OrderDiscountCollectionType"
         >
             <argument type="service" id="sylius.factory.adjustment" />
+            <argument type="service" id="setono_sylius_order_edit.setter.order_discount_adjustment" />
             <tag name="form.type"/>
         </service>
 
@@ -25,12 +27,15 @@
             class="Setono\SyliusOrderEditPlugin\Form\Type\OrderItemDiscountCollectionType"
         >
             <argument type="service" id="sylius.factory.adjustment" />
+            <argument type="service" id="setono_sylius_order_edit.adder.discount_adjustments" />
             <tag name="form.type"/>
         </service>
 
         <!-- Form type extensions -->
-        <service id="setono_sylius_order_edit.form.extension.order"
-                 class="Setono\SyliusOrderEditPlugin\Form\Extension\OrderTypeExtension">
+        <service
+            id="setono_sylius_order_edit.form.extension.order"
+            class="Setono\SyliusOrderEditPlugin\Form\Extension\OrderTypeExtension"
+        >
             <tag name="form.type_extension"/>
         </service>
     </services>
diff --git a/src/Resources/config/services/order_processing.xml b/src/Resources/config/services/order_processing.xml
index 14e501b..9c8a21d 100644
--- a/src/Resources/config/services/order_processing.xml
+++ b/src/Resources/config/services/order_processing.xml
@@ -57,5 +57,21 @@
             <argument type="service" id="doctrine.orm.entity_manager" />
             <argument type="service" id="setono_sylius_order_edit.event_bus" />
         </service>
+
+        <service
+            id="setono_sylius_order_edit.adder.discount_adjustments"
+            class="Setono\SyliusOrderEditPlugin\Adder\DiscountAdjustmentsAdder"
+        >
+            <argument type="service" id="sylius.integer_distributor" />
+            <argument type="service" id="sylius.factory.adjustment" />
+        </service>
+
+        <service
+            id="setono_sylius_order_edit.setter.order_discount_adjustment"
+            class="Setono\SyliusOrderEditPlugin\Setter\OrderDiscountAdjustmentSetter"
+        >
+            <argument type="service" id="sylius.integer_distributor" />
+            <argument type="service" id="setono_sylius_order_edit.adder.discount_adjustments" />
+        </service>
     </services>
 </container>
diff --git a/src/Setter/OrderDiscountAdjustmentSetter.php b/src/Setter/OrderDiscountAdjustmentSetter.php
new file mode 100644
index 0000000..d0f5396
--- /dev/null
+++ b/src/Setter/OrderDiscountAdjustmentSetter.php
@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Setono\SyliusOrderEditPlugin\Setter;
+
+use Setono\SyliusOrderEditPlugin\Adder\DiscountAdjustmentsAdderInterface;
+use Setono\SyliusOrderEditPlugin\Model\AdjustmentTypes;
+use Sylius\Component\Core\Distributor\IntegerDistributorInterface;
+use Sylius\Component\Core\Model\OrderInterface;
+use Sylius\Component\Core\Model\OrderItemInterface;
+
+final class OrderDiscountAdjustmentSetter implements OrderDiscountAdjustmentSetterInterface
+{
+    public function __construct(
+        private readonly IntegerDistributorInterface $integerDistributor,
+        private readonly DiscountAdjustmentsAdderInterface $orderItemDiscountAdjustmentAdder,
+    ) {
+    }
+
+    public function set(OrderInterface $order, int $discount): void
+    {
+        $items = $order->getItems();
+        /** @var int $orderId */
+        $orderId = $order->getId();
+
+        $distributedPrices = $this->integerDistributor->distribute($discount, $items->count());
+
+        /** @var int $distribution */
+        foreach ($distributedPrices as $i => $distribution) {
+            /** @var OrderItemInterface $item */
+            $item = $items->get($i);
+            $this->orderItemDiscountAdjustmentAdder->add(
+                $item,
+                AdjustmentTypes::SETONO_ADMIN_ORDER_DISCOUNT,
+                AdjustmentTypes::SETONO_ADMIN_ORDER_DISCOUNT . '_' . $orderId,
+                'Custom order discount',
+                -$distribution,
+            );
+        }
+    }
+}
diff --git a/src/Setter/OrderDiscountAdjustmentSetterInterface.php b/src/Setter/OrderDiscountAdjustmentSetterInterface.php
new file mode 100644
index 0000000..579d372
--- /dev/null
+++ b/src/Setter/OrderDiscountAdjustmentSetterInterface.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Setono\SyliusOrderEditPlugin\Setter;
+
+use Sylius\Component\Core\Model\OrderInterface;
+
+interface OrderDiscountAdjustmentSetterInterface
+{
+    public function set(OrderInterface $order, int $discount): void;
+}
diff --git a/tests/Application/templates/bundles/SyliusAdminBundle/Order/Show/Summary/_item.html.twig b/tests/Application/templates/bundles/SyliusAdminBundle/Order/Show/Summary/_item.html.twig
index daf5aa7..74d6efb 100644
--- a/tests/Application/templates/bundles/SyliusAdminBundle/Order/Show/Summary/_item.html.twig
+++ b/tests/Application/templates/bundles/SyliusAdminBundle/Order/Show/Summary/_item.html.twig
@@ -2,6 +2,7 @@
 
 {% set orderPromotionAdjustment = constant('Sylius\\Component\\Core\\Model\\AdjustmentInterface::ORDER_PROMOTION_ADJUSTMENT') %}
 {% set unitPromotionAdjustment = constant('Sylius\\Component\\Core\\Model\\AdjustmentInterface::ORDER_UNIT_PROMOTION_ADJUSTMENT') %}
+{% set adminOrderDiscountAdjustment = constant('Setono\\SyliusOrderEditPlugin\\Model\\AdjustmentTypes::SETONO_ADMIN_ORDER_DISCOUNT') %}
 {% set adminOrderItemDiscountAdjustment = constant('Setono\\SyliusOrderEditPlugin\\Model\\AdjustmentTypes::SETONO_ADMIN_ORDER_ITEM_DISCOUNT') %}
 {% set shippingAdjustment = constant('Sylius\\Component\\Core\\Model\\AdjustmentInterface::SHIPPING_ADJUSTMENT') %}
 {% set taxAdjustment = constant('Sylius\\Component\\Core\\Model\\AdjustmentInterface::TAX_ADJUSTMENT') %}
@@ -23,13 +24,22 @@
         {{ money.format(item.unitPrice, order.currencyCode) }}
     </td>
     <td class="right aligned unit-discount">
-        {{ money.format(item.units.first.adjustmentsTotal(unitPromotionAdjustment), order.currencyCode) }}
+        {{ money.format(
+            item.units.first.adjustmentsTotal(unitPromotionAdjustment) + item.units.first.adjustmentsTotal(adminOrderItemDiscountAdjustment),
+            order.currencyCode
+        ) }}
     </td>
     <td class="right aligned unit-order-discount">
-        <span style="font-style: italic;">~ {{ money.format(item.units.first.adjustmentsTotal(orderPromotionAdjustment), order.currencyCode) }}</span>
+        <span style="font-style: italic;">~ {{ money.format(
+            item.units.first.adjustmentsTotal(orderPromotionAdjustment) + item.units.first.adjustmentsTotal(adminOrderDiscountAdjustment),
+            order.currencyCode
+        ) }}</span>
     </td>
     <td class="right aligned discounted-unit-price">
-        {{ money.format(item.fullDiscountedUnitPrice, order.currencyCode) }}
+        {{ money.format(
+            item.fullDiscountedUnitPrice + item.units.first.adjustmentsTotal(adminOrderItemDiscountAdjustment) + item.units.first.adjustmentsTotal(adminOrderDiscountAdjustment),
+            order.currencyCode
+        ) }}
     </td>
     <td class="right aligned quantity">
         {{ item.quantity }}
@@ -49,14 +59,3 @@
         {{ money.format(item.total, order.currencyCode) }}
     </td>
 </tr>
-{% set discounts = item.getAdjustments(adminOrderItemDiscountAdjustment) %}
-{% if discounts is not empty %}
-<tr>
-    <td colspan="9">
-        <strong>{{ 'setono_sylius_order_edit.ui.discounts'|trans }}:</strong>
-        {% for discount in discounts %}
-            {{ money.format(discount.amount, order.currencyCode) }}{% if not loop.last %}, {% endif %}
-        {% endfor %}
-    </td>
-</tr>
-{% endif %}
diff --git a/tests/Application/templates/bundles/SyliusAdminBundle/Order/Show/Summary/_totalsPromotions.html.twig b/tests/Application/templates/bundles/SyliusAdminBundle/Order/Show/Summary/_totalsPromotions.html.twig
index 46db361..969d063 100644
--- a/tests/Application/templates/bundles/SyliusAdminBundle/Order/Show/Summary/_totalsPromotions.html.twig
+++ b/tests/Application/templates/bundles/SyliusAdminBundle/Order/Show/Summary/_totalsPromotions.html.twig
@@ -3,12 +3,14 @@
 {% set orderPromotionAdjustment = constant('Sylius\\Component\\Core\\Model\\AdjustmentInterface::ORDER_PROMOTION_ADJUSTMENT') %}
 {% set unitPromotionAdjustment = constant('Sylius\\Component\\Core\\Model\\AdjustmentInterface::ORDER_UNIT_PROMOTION_ADJUSTMENT') %}
 {% set adminOrderDiscountAdjustment = constant('Setono\\SyliusOrderEditPlugin\\Model\\AdjustmentTypes::SETONO_ADMIN_ORDER_DISCOUNT') %}
+{% set adminOrderItemDiscountAdjustment = constant('Setono\\SyliusOrderEditPlugin\\Model\\AdjustmentTypes::SETONO_ADMIN_ORDER_ITEM_DISCOUNT') %}
 
 <tr>
     <td colspan="5" id="promotion-discounts" class="promotion-disabled">
         {% set orderPromotionAdjustments = sylius_aggregate_adjustments(order.getAdjustmentsRecursively(orderPromotionAdjustment)) %}
         {% set unitPromotionAdjustments = sylius_aggregate_adjustments(order.getAdjustmentsRecursively(unitPromotionAdjustment)) %}
         {% set adminOrderDiscountAdjustments = sylius_aggregate_adjustments(order.getAdjustmentsRecursively(adminOrderDiscountAdjustment)) %}
+        {% set adminOrderItemDiscountAdjustments = sylius_aggregate_adjustments(order.getAdjustmentsRecursively(adminOrderItemDiscountAdjustment)) %}
         {% set promotionAdjustments = orderPromotionAdjustments|merge(unitPromotionAdjustments)|merge(adminOrderDiscountAdjustments) %}
         {% if not promotionAdjustments is empty %}
             <div class="ui relaxed divided list">
@@ -28,7 +30,8 @@
         {% set orderPromotionTotal = order.getAdjustmentsTotalRecursively(orderPromotionAdjustment) %}
         {% set unitPromotionTotal = order.getAdjustmentsTotalRecursively(unitPromotionAdjustment) %}
         {% set adminOrderDiscountTotal = order.getAdjustmentsTotalRecursively(adminOrderDiscountAdjustment) %}
+        {% set adminOrderItemDiscountTotal = order.getAdjustmentsTotalRecursively(adminOrderItemDiscountAdjustment) %}
         <strong>{{ 'sylius.ui.promotion_total'|trans }}</strong>:
-        {{ money.format(orderPromotionTotal + unitPromotionTotal + adminOrderDiscountTotal, order.currencyCode) }}
+        {{ money.format(orderPromotionTotal + unitPromotionTotal + adminOrderDiscountTotal + adminOrderItemDiscountTotal, order.currencyCode) }}
     </td>
 </tr>
diff --git a/tests/Functional/OrderUpdateTest.php b/tests/Functional/OrderUpdateTest.php
index d7fe5d2..e9ab8cb 100644
--- a/tests/Functional/OrderUpdateTest.php
+++ b/tests/Functional/OrderUpdateTest.php
@@ -116,7 +116,7 @@ public function testItAllowsToAddAndRemoveDiscountsForTheWholeOrderMultipleTimes
         /** @var EditableOrderInterface $order */
         $order = $this->getOrderRepository()->findOneBy(['tokenValue' => 'TOKEN']);
         self::assertSame($initialOrderTotalWithoutTaxes - 200, $this->getResultTotal($order));
-        self::assertSame(-200, $order->getAdjustmentsTotal(AdjustmentTypes::SETONO_ADMIN_ORDER_DISCOUNT));
+        self::assertSame(-200, $order->getAdjustmentsTotalRecursively(AdjustmentTypes::SETONO_ADMIN_ORDER_DISCOUNT));
     }
 
     public function testItDoesNotAllowToExceedTheInitialOrderTotal(): void
@@ -157,10 +157,9 @@ public function testItAllowsToAddDiscountsForTheSpecificOrderItem(): void
         /** @var OrderInterface $order */
         $order = $this->getOrderRepository()->findOneBy(['tokenValue' => 'TOKEN']);
         self::assertSame($initialOrderTotalWithoutTaxes - 100, $this->getResultTotal($order));
-        self::assertSame(0, $order->getAdjustmentsTotal(AdjustmentTypes::SETONO_ADMIN_ORDER_DISCOUNT));
         self::assertSame(
             -100,
-            $order->getItems()->first()->getAdjustmentsTotal(AdjustmentTypes::SETONO_ADMIN_ORDER_ITEM_DISCOUNT),
+            $order->getItems()->first()->getAdjustmentsTotalRecursively(AdjustmentTypes::SETONO_ADMIN_ORDER_ITEM_DISCOUNT),
         );
     }
 
@@ -183,10 +182,9 @@ public function testItAllowsToAddAndRemoveDiscountsForTheOrderItemMultipleTimes(
         /** @var EditableOrderInterface $order */
         $order = $this->getOrderRepository()->findOneBy(['tokenValue' => 'TOKEN']);
         self::assertSame($initialOrderTotalWithoutTaxes - 200, $this->getResultTotal($order));
-        self::assertSame(0, $order->getAdjustmentsTotal(AdjustmentTypes::SETONO_ADMIN_ORDER_DISCOUNT));
         self::assertSame(
             -200,
-            $order->getItems()->first()->getAdjustmentsTotal(AdjustmentTypes::SETONO_ADMIN_ORDER_ITEM_DISCOUNT),
+            $order->getItems()->first()->getAdjustmentsTotalRecursively(AdjustmentTypes::SETONO_ADMIN_ORDER_ITEM_DISCOUNT),
         );
     }
 
diff --git a/tests/Unit/Adder/DiscountAdjustmentsAdderTest.php b/tests/Unit/Adder/DiscountAdjustmentsAdderTest.php
new file mode 100644
index 0000000..a9c1ae8
--- /dev/null
+++ b/tests/Unit/Adder/DiscountAdjustmentsAdderTest.php
@@ -0,0 +1,67 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Setono\SyliusOrderEditPlugin\Tests\Unit\Adder;
+
+use Doctrine\Common\Collections\ArrayCollection;
+use PHPUnit\Framework\TestCase;
+use Prophecy\PhpUnit\ProphecyTrait;
+use Setono\SyliusOrderEditPlugin\Adder\DiscountAdjustmentsAdder;
+use Setono\SyliusOrderEditPlugin\Model\AdjustmentTypes;
+use Sylius\Component\Core\Distributor\IntegerDistributorInterface;
+use Sylius\Component\Core\Model\AdjustmentInterface;
+use Sylius\Component\Core\Model\OrderItemInterface;
+use Sylius\Component\Core\Model\OrderItemUnitInterface;
+use Sylius\Component\Order\Factory\AdjustmentFactoryInterface;
+
+final class DiscountAdjustmentsAdderTest extends TestCase
+{
+    use ProphecyTrait;
+
+    public function testItAddsDiscountAdjustmentsOnOrderItemUnits(): void
+    {
+        $integerDistributor = $this->prophesize(IntegerDistributorInterface::class);
+        $adjustmentFactory = $this->prophesize(AdjustmentFactoryInterface::class);
+
+        $item = $this->prophesize(OrderItemInterface::class);
+        $firstUnit = $this->prophesize(OrderItemUnitInterface::class);
+        $secondUnit = $this->prophesize(OrderItemUnitInterface::class);
+        $thirdUnit = $this->prophesize(OrderItemUnitInterface::class);
+
+        $adder = new DiscountAdjustmentsAdder(
+            $integerDistributor->reveal(),
+            $adjustmentFactory->reveal(),
+        );
+
+        $item->getQuantity()->willReturn(3);
+        $item->getUnits()->willReturn(new ArrayCollection(
+            [$firstUnit->reveal(), $secondUnit->reveal(), $thirdUnit->reveal()],
+        ));
+
+        $integerDistributor->distribute(-1000, 3)->willReturn([-333, -333, -334]);
+
+        $firstAdjustment = $this->prophesize(AdjustmentInterface::class);
+        $secondAdjustment = $this->prophesize(AdjustmentInterface::class);
+        $thirdAdjustment = $this->prophesize(AdjustmentInterface::class);
+
+        $adjustmentFactory
+            ->createWithData(AdjustmentTypes::SETONO_ADMIN_ORDER_DISCOUNT, 'Label', -333)
+            ->willReturn($firstAdjustment->reveal(), $secondAdjustment->reveal())
+        ;
+        $adjustmentFactory
+            ->createWithData(AdjustmentTypes::SETONO_ADMIN_ORDER_DISCOUNT, 'Label', -334, )
+            ->willReturn($thirdAdjustment->reveal())
+        ;
+
+        $firstAdjustment->setOriginCode('ORIGIN_CODE')->shouldBeCalled();
+        $secondAdjustment->setOriginCode('ORIGIN_CODE')->shouldBeCalled();
+        $thirdAdjustment->setOriginCode('ORIGIN_CODE')->shouldBeCalled();
+
+        $firstUnit->addAdjustment($firstAdjustment->reveal())->shouldBeCalled();
+        $secondUnit->addAdjustment($secondAdjustment->reveal())->shouldBeCalled();
+        $thirdUnit->addAdjustment($thirdAdjustment->reveal())->shouldBeCalled();
+
+        $adder->add($item->reveal(), AdjustmentTypes::SETONO_ADMIN_ORDER_DISCOUNT, 'ORIGIN_CODE', 'Label', -1000);
+    }
+}
diff --git a/tests/Unit/Setter/OrderDiscountAdjustmentSetterTest.php b/tests/Unit/Setter/OrderDiscountAdjustmentSetterTest.php
new file mode 100644
index 0000000..74deb92
--- /dev/null
+++ b/tests/Unit/Setter/OrderDiscountAdjustmentSetterTest.php
@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Setono\SyliusOrderEditPlugin\Tests\Unit\Setter;
+
+use Doctrine\Common\Collections\ArrayCollection;
+use PHPUnit\Framework\TestCase;
+use Prophecy\PhpUnit\ProphecyTrait;
+use Setono\SyliusOrderEditPlugin\Adder\DiscountAdjustmentsAdderInterface;
+use Setono\SyliusOrderEditPlugin\Entity\EditableOrderInterface;
+use Setono\SyliusOrderEditPlugin\Model\AdjustmentTypes;
+use Setono\SyliusOrderEditPlugin\Setter\OrderDiscountAdjustmentSetter;
+use Sylius\Component\Core\Distributor\IntegerDistributorInterface;
+use Sylius\Component\Core\Model\OrderItemInterface;
+
+final class OrderDiscountAdjustmentSetterTest extends TestCase
+{
+    use ProphecyTrait;
+
+    public function testItDistributesDiscountsOnOrderItemUnits(): void
+    {
+        $integerDistributor = $this->prophesize(IntegerDistributorInterface::class);
+        $orderItemDiscountAdjustmentAdder = $this->prophesize(DiscountAdjustmentsAdderInterface::class);
+
+        $setter = new OrderDiscountAdjustmentSetter(
+            $integerDistributor->reveal(),
+            $orderItemDiscountAdjustmentAdder->reveal(),
+        );
+
+        $order = $this->prophesize(EditableOrderInterface::class);
+        $firstItem = $this->prophesize(OrderItemInterface::class);
+        $secondItem = $this->prophesize(OrderItemInterface::class);
+        $order->getItems()->willReturn(new ArrayCollection([$firstItem->reveal(), $secondItem->reveal()]));
+        $order->getId()->willReturn(100);
+
+        $integerDistributor
+            ->distribute(1000, 2)
+            ->willReturn([500, 500])
+        ;
+
+        $orderItemDiscountAdjustmentAdder
+            ->add($firstItem->reveal(), AdjustmentTypes::SETONO_ADMIN_ORDER_DISCOUNT, AdjustmentTypes::SETONO_ADMIN_ORDER_DISCOUNT . '_100', 'Custom order discount', -500)
+            ->shouldBeCalled()
+        ;
+
+        $orderItemDiscountAdjustmentAdder
+            ->add($secondItem->reveal(), AdjustmentTypes::SETONO_ADMIN_ORDER_DISCOUNT, AdjustmentTypes::SETONO_ADMIN_ORDER_DISCOUNT . '_100', 'Custom order discount', -500)
+            ->shouldBeCalled()
+        ;
+
+        $setter->set($order->reveal(), 1000);
+    }
+}