diff --git a/src/Api/Transaction/Start.php b/src/Api/Transaction/Start.php
index 8ea771a0..2e95c377 100644
--- a/src/Api/Transaction/Start.php
+++ b/src/Api/Transaction/Start.php
@@ -306,9 +306,6 @@ public function setPaymentOptionId($paymentOptionId)
 
     public function setPaymentOptionSubId($paymentOptionSubId)
     {
-        if (!is_numeric($paymentOptionSubId)) {
-            throw new Error('PaymentOptionSubId is niet numeriek', 1);
-        }
         $this->_paymentOptionSubId = $paymentOptionSubId;
     }