How To Fix WRF_APC302 - Cannot make changes to material &1

SAP Error Message - Details

• Message type: E = Error

• Message class: WRF_APC - Messages for Operational Assortment Planning and Control

• Message number: 302

• Message text: Cannot make changes to material &1

What causes this issue?

The target material &V1& is locked by another user and cannot be
changed by the copy process.

System Response

The following options could not be selected:
Copy Characteristic Values
Copy Prepacks
Copy Prepack Assignment
Copy Variant Assignment

How to fix this error?

Change the copy options.

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

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_APC302 - Cannot make changes to material &1 ?

  SAP Error Message:
  
  WRF_APC302: Cannot make changes to material &1
  
  Cause:
  This error typically occurs when you try to make changes to a material master record that is currently locked or controlled by a process that restricts modifications. Common reasons include:
  
  The material is locked due to an ongoing background job or process (e.g., a mass update, data transfer, or integration process).
  The material is part of a controlled environment where changes are restricted (e.g., during a production run, planning run, or when the material is flagged as locked in the system).
  The material is under change lock due to workflow or approval processes.
  The material is being processed in Advanced Planning and Optimization (APO) or another SCM component, which restricts direct changes in ECC.
  
  
  Solution:
  
  
  Check Lock Status:
  
  Use transaction SM12 to check if there is a lock entry for the material. If a lock exists, determine if it is safe to delete the lock or wait for the process to complete.
  
  
  
  Check Background Jobs:
  
  Verify if any background jobs or batch processes are running that might be locking the material.
  
  
  
  Check APO or SCM Integration:
  
  If the material is integrated with APO or other SCM components, ensure that changes are made in the correct system or during allowed time windows.
  
  
  
  Check Workflow or Approval:
  
  If the material change is controlled by a workflow, check the status of the workflow and complete or release it as necessary.
  
  
  
  Authorization:
  
  Ensure you have the necessary authorizations to change the material master data.
  
  
  
  Wait and Retry:
  
  Sometimes, the lock is temporary. Waiting for the process to finish and retrying might resolve the issue.
  
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  MM02 – Change Material Master
  SM12 – Display and delete lock entries
  SM37 – Monitor background jobs
  /SAPAPO/MAT1 – Material master in APO (if applicable)
  
  
  
  Notes and Documentation:
  
  Check SAP Notes related to material master locks and APO integration.
  Review system logs (SM21) for related errors or warnings.
  
  
  
  Best Practices:
  
  Avoid making changes during peak processing times or when batch jobs are running.
  Coordinate changes with SCM/APO teams if integration exists.
  Use proper change management and approval workflows.
  
  
  
  
  If the problem persists after these checks, consider raising a support ticket with SAP, providing details such as material number, user ID, transaction used, and system logs.