How To Fix COWIPB327 - Assignment can no longer be changed (GR already exists)

SAP Error Message - Details

• Message type: E = Error

• Message class: COWIPB - Messages for WIP Batch

• Message number: 327

• Message text: Assignment can no longer be changed (GR already exists)

What causes this issue?

You have attempted to revoke the assignment of a WIP batch to an order
item. This is not possible because a goods receipt has already been
posted against this order item.

System Response

The system terminates the function.

How to fix this error?

If you have to revoke the assignment, you must first reverse the goods
receipt. You can then revoke the assignment of the WIP batch to the
order item.
If you are entering goods receipts for the order via the confirmation
CO11N or COR6N), you must cancel the confirmation in which you posted
the goods receipt and all subsequent confirmations using the function
<ZK>Cancel Confirmation for Production Order</> (CO13) or <ZK>Cancel
Confirmation for Process Order</> (CORS).
If you are entering goods receipts for the order using the goods
movement transactions of Inventory Management (e.g. transaction MIGO),
you must cancel the corresponding material document.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message COWIPB327 - Assignment can no longer be changed (GR already exists) ?

  The SAP error message COWIPB327, which states "Assignment can no longer be changed (GR already exists)," typically occurs in the context of inventory management and goods receipt (GR) processes. This error indicates that an attempt is being made to change an assignment (such as a purchase order or a production order) that has already been linked to a goods receipt. Once a goods receipt has been posted, the assignment is locked for further changes to maintain data integrity.
  Cause:
  
  Goods Receipt Already Posted: The primary cause of this error is that a goods receipt has already been recorded against the assignment you are trying to change. This means that the system has already processed the inventory movement, and any changes to the assignment could lead to inconsistencies in inventory records.
  Locked Assignment: The assignment is locked for changes because it is already in use by a completed transaction (like a GR).
  
  Solution:
  
  Review the Goods Receipt: Check the goods receipt document to confirm that it has indeed been posted. You can do this by navigating to the relevant transaction (e.g., MIGO) and reviewing the document flow.
  Avoid Changes: If the goods receipt is already posted, you will need to avoid making changes to the assignment. If changes are necessary, consider the following:
  
  Reverse the Goods Receipt: If you need to change the assignment, you may need to reverse the goods receipt first. This can be done using the MIGO transaction by selecting the appropriate reversal option.
  Create a New Assignment: If reversing the goods receipt is not feasible, consider creating a new assignment instead of modifying the existing one.
  
  
  Consult with Your Team: If you are unsure about the implications of reversing a goods receipt or making changes, consult with your inventory management or finance team to ensure that you follow the correct procedures.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MIGO (Goods Movement), MB03 (Display Material Document), and ME23N (Display Purchase Order) to navigate and review documents related to the error.
  SAP Notes: Check SAP Notes and Knowledge Base Articles for any specific patches or updates related to this error message.
  User Permissions: Ensure that you have the necessary permissions to perform the actions required to resolve the issue.
  
  By following these steps, you should be able to address the COWIPB327 error effectively. If the problem persists, consider reaching out to your SAP support team for further assistance.