How To Fix RM166 - Run schedule header & is blocked by another user

RM166 - Overview

• Message type: E = Error

• Message class: RM - Messages for Repetitive Manufacturing

• Message number: 166

• Message text: Run schedule header & is blocked by another user

What causes this issue?

The run schedule header that you called up is currenty being processed
by another user. This is why it is blocked.

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?

Try to access the run schedule header again later.

Error message extract from SAP system. Copyright SAP SE.

RM166 - Details

• The SAP error message RM166 indicates that a run schedule header is blocked by another user. This typically occurs in the context of batch processing or scheduling jobs in SAP, where multiple users or processes may attempt to access or modify the same scheduling object simultaneously.
  
  Cause:
  
  Concurrent Access: Another user or process is currently accessing or modifying the run schedule header, leading to a lock on that object.
  Long-Running Processes: If a job or process is taking a long time to complete, it may hold the lock for an extended period, preventing other users from accessing it.
  System Configuration: Certain configurations or settings in the SAP system may lead to locking issues, especially in environments with high concurrency.
  
  
  Solution:
  
  Wait and Retry: The simplest solution is to wait for the other user or process to complete its operation. After a short period, try to access the run schedule header again.
  Identify the Lock: Use transaction code