How To Fix MM634 - Material &1 cannot be locked because scheduled changes exist

SAP Error Message - Details

• Message type: E = Error

• Message class: MM - Messages for material master maintenance and Customizing

• Message number: 634

• Message text: Material &1 cannot be locked because scheduled changes exist

What causes this issue?

Scheduled changes to lock-relevant fields exist for the material &V1&.
The material can be locked only after the scheduled changes have been
activated.

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 MM634 - Material &1 cannot be locked because scheduled changes exist ?

  The SAP error message MM634 ("Material &1 cannot be locked because scheduled changes exist") typically occurs when you attempt to perform an operation on a material (such as changing its master data) that is currently being modified or scheduled for modification in the system. This can happen in various scenarios, such as when there are pending changes in the material master data that have not yet been processed.
  Cause:
  
  Pending Changes: There are scheduled changes for the material that have not yet been executed. This could be due to a change request that is still in process.
  Locking Mechanism: SAP uses a locking mechanism to prevent simultaneous changes to the same data. If a change is scheduled, the system locks the material to ensure data integrity.
  Background Jobs: Sometimes, background jobs that are scheduled to update material data may be running, causing the material to be locked.
  
  Solution:
  
  
  Check Scheduled Changes: 
  
  Use transaction code MM02 (Change Material) or MM03 (Display Material) to check if there are any scheduled changes for the material.
  You can also check the change logs to see if there are any pending changes.
  
  
  
  Wait for Processing: If there are scheduled changes, you may need to wait until those changes are processed. You can check the status of background jobs using transaction code SM37.
  
  
  Release Locks: If you have the necessary authorizations, you can release the locks on the material using transaction code SM12. However, be cautious with this approach, as it may lead to data inconsistencies if not handled properly.
  
  
  Check Change Requests: If the changes are part of a change request, ensure that the request is completed and released.
  
  
  Consult with Colleagues: If you are unsure about the changes or the locking situation, consult with colleagues or your SAP administrator to understand the context of the scheduled changes.
  
  
  Related Information:
  
  Transaction Codes:
  
  MM02: Change Material
  MM03: Display Material
  SM12: Display and Delete Locks
  SM37: Monitor Background Jobs
  
  
  SAP Notes: Check SAP Notes for any specific issues related to this error message, as there may be updates or patches that address known issues.
  Documentation: Review SAP documentation related to material master data management for best practices and guidelines.
  
  By following these steps, you should be able to resolve the MM634 error and proceed with your material data changes.