How To Fix WRF_AT142 - Change of DC to &1 not allowed (DC is already assigned to another item)

WRF_AT142 - Overview

• Message type: E = Error

• Message class: WRF_AT - Messages for Allocation Table RTFASH

• Message number: 142

• Message text: Change of DC to &1 not allowed (DC is already assigned to another item)

What causes this issue?

You tried to change the distribution center of a purchase order item to
&V1&. You cannot use a distribution center in multiple purchase order
items, however.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

WRF_AT142 - Details

• SAP Error Message:
  WRF_AT142 - Change of DC to &1 not allowed (DC is already assigned to another item)
  
  
  Cause:
  This error occurs when you try to change the Distribution Channel (DC) of a sales document item to a value that is already assigned to another item within the same sales document. In SAP SD (Sales and Distribution), certain combinations of sales document items must have unique distribution channels, or the system restricts changing the distribution channel to avoid inconsistencies.
  Specifically, the system checks if the distribution channel you want to assign to an item is already used by another item in the same sales document where such duplication is not allowed. This is often related to the business rules configured in the system or the document type settings.
  
  Explanation:
  
  Distribution Channel (DC) is a key organizational element in SAP SD that represents the channel through which products or services reach the customer (e.g., retail, wholesale,