diff --git a/api-specs/import/types/discount-code-import.raml b/api-specs/import/types/discount-code-import.raml
index 0abd7838f..f7c904f7e 100644
--- a/api-specs/import/types/discount-code-import.raml
+++ b/api-specs/import/types/discount-code-import.raml
@@ -31,6 +31,8 @@ types:
       code:
         description: |
           User-defined unique identifier of the DiscountCode that is used by the customer to apply the discount.
+
+          The value cannot be updated. Attempting to update the value will result in an [InvalidFieldsUpdate](/error#invalidfieldsupdateerror) error.
         type: string
       cartDiscounts:
         description: |
diff --git a/api-specs/import/types/error.raml b/api-specs/import/types/error.raml
index 2d3c2a87a..3c32b7496 100644
--- a/api-specs/import/types/error.raml
+++ b/api-specs/import/types/error.raml
@@ -129,6 +129,19 @@ types:
       resourceIndex?:
         type: integer
         format: long
+  InvalidFieldsUpdateError:
+    description: |
+      Returned when a field cannot be updated.
+    type: ErrorObject
+    discriminatorValue: InvalidFieldUpdate
+    properties:
+      message:
+        type: string
+        description: |
+          `"The following fields are currently not supported for changes/updates"`
+      fields:
+        description: Fields that cannot be updated.
+        type: string[]
   InvalidJsonInput:
     description: |
       An invalid JSON input has been sent to the service.
diff --git a/api-specs/import/types/standalone-price-import.raml b/api-specs/import/types/standalone-price-import.raml
index 86556223c..eb1f9235d 100644
--- a/api-specs/import/types/standalone-price-import.raml
+++ b/api-specs/import/types/standalone-price-import.raml
@@ -31,14 +31,20 @@ types:
       country?:
         description: |
           Sets the country for which this Price is valid.
+
+          The value cannot be updated. Attempting to update the value will result in an [InvalidFieldsUpdate](/error#invalidfieldsupdateerror) error.
         type: common.CountryCode
       customerGroup?:
         description: |
           Sets the CustomerGroup for which this Price is valid.
+
+          The value cannot be updated. Attempting to update the value will result in an [InvalidFieldsUpdate](/error#invalidfieldsupdateerror) error.
         type: common.CustomerGroupKeyReference
       channel?:
         description: |
-          Sets the product distribution Channel for which this Price is valid
+          Sets the product distribution Channel for which this Price is valid.
+
+          The value cannot be updated. Attempting to update the value will result in an [InvalidFieldsUpdate](/error#invalidfieldsupdateerror) error.
         type: common.ChannelKeyReference
       validFrom?:
         description: |