How To Fix MILL_PC327 - Assignment can no longer be changed as GR already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: MILL_PC - Mill: Message Pool for Confirmations

• Message number: 327

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

copied from HM6

What causes this issue?

You tried to remove the assignment of a process batch to an order item.
This is not possible, because a goods receipt has already been posted
for this order item.

System Response

The system cancels the function.

How to fix this error?

If you need to remove the assignment, you must first cancel the goods
receipt. You can then remove the assignment between the process batch
and the order item.
If you enter goods receipts for an order using the confirmation
(CO11N), you must cancel the confirmation in which you posted the goods
receipt, and all subsequent functions, using the function <ZK>Cancel
confirmation for production order</> (CO13).
If you enter goods receipts for an order using the goods movement
transactions for inventory management (for example, transaction MIGO),
you must cancel the relevant 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 MILL_PC327 - Assignment can no longer be changed as GR already exists ?

  The SAP error message MILL_PC327 ("Assignment can no longer be changed as GR already exists") typically occurs in the context of production planning and materials management, particularly when dealing with production orders and goods receipts (GR). This error indicates that an attempt is being made to change an assignment (such as a component assignment to a production order) after a goods receipt has already been posted for that production order.
  Cause:
  The primary cause of this error is that once a goods receipt has been posted for a production order, the system locks certain aspects of that order to maintain data integrity. This means that you cannot change the assignment of components or other related data because it could lead to inconsistencies in inventory and accounting records.
  Solution:
  To resolve this error, consider the following steps:
  
  
  Check the Status of the Production Order: Verify the status of the production order. If the order is already completed or has a goods receipt posted, you will not be able to change the assignment.
  
  
  Review Goods Receipt: If the goods receipt was posted in error, you may need to reverse the goods receipt. This can be done using transaction code MBST (Cancel Goods Movement) or MIGO (Goods Movement) depending on your system configuration.
  
  
  Create a New Production Order: If the assignment needs to be changed and the goods receipt cannot be reversed, consider creating a new production order with the correct assignments.
  
  
  Consult with Your SAP Administrator: If you are unsure about the implications of reversing a goods receipt or changing a production order, consult with your SAP administrator or a functional consultant who can provide guidance based on your organization's processes.
  
  
  Documentation and Training: Ensure that users are trained on the implications of posting goods receipts and the restrictions that come with it. Proper documentation can help prevent similar issues in the future.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CO02 (Change Production Order), MBST (Cancel Goods Movement), and MIGO (Goods Movement).
  SAP Notes: Check for any SAP Notes related to this error message for additional insights or patches that may address specific issues.
  User Roles and Permissions: Ensure that users have the appropriate roles and permissions to perform the necessary actions without encountering this error.
  
  By following these steps, you should be able to address the error and understand the underlying processes that lead to it.