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

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message WRF_AT142 - Change of DC to &1 not allowed (DC is already assigned to another item) ?

  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, direct sales).
  In some sales documents, the system requires that each item has a unique distribution channel or restricts changing the DC if it conflicts with existing items.
  The error prevents inconsistent or conflicting data in sales documents.
  
  
  Solution:
  
  
  Check the Sales Document Items:
  
  Review all items in the sales document.
  Identify which items have the distribution channel you want to assign.
  Confirm if changing the DC is necessary or if the business process allows multiple items with the same DC.
  
  
  
  Adjust the Distribution Channel:
  
  If the business process allows, assign a different distribution channel that is not already used by another item.
  If the DC must be the same for multiple items, check the configuration or customization to allow this.
  
  
  
  Review Customizing Settings:
  
  Check the sales document type and item category settings in SPRO under:
  Sales and Distribution -> Sales -> Sales Documents -> Sales Document Item -> Define Item Categories
  Verify if there are restrictions on distribution channel changes or uniqueness constraints.
  
  
  
  Check User Exits or Enhancements:
  
  Sometimes, custom code (user exits, BADIs) enforces additional checks on distribution channels.
  Review any custom logic that might be causing this restriction.
  
  
  
  Consult with Functional Team:
  
  If unsure about the business rules, consult with the SD functional consultant or business process owner to understand the intended behavior.
  
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  VA01 / VA02 / VA03 — Create / Change / Display Sales Order
  SPRO — Customizing for Sales and Distribution
  
  
  
  SAP Notes:
  
  Check SAP Service Marketplace for any notes related to WRF_AT142 or distribution channel assignment issues.
  
  
  
  Tables:
  
  VBAK — Sales Document: Header Data
  VBAP — Sales Document: Item Data
  
  
  
  Common Scenarios:
  
  Changing distribution channel in sales orders with multiple items.
  Sales documents with mixed distribution channels.
  Integration with pricing or condition records that depend on distribution channel.
  
  
  
  
  Summary:
  The error WRF_AT142 occurs because the system does not allow changing the distribution channel of a sales document item to a value already assigned to another item in the same document. To resolve it, verify the distribution channels assigned to all items, adjust the DC accordingly, and review configuration or custom logic that enforces this restriction.