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