How To Fix MD751 - &1 for the production lot &2 is already being processed by &3

SAP Error Message - Details

• Message type: E = Error

• Message class: MD - Material Requirements Planning (MRP)

• Message number: 751

• Message text: &1 for the production lot &2 is already being processed by &3

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message MD751 - &1 for the production lot &2 is already being processed by &3 ?

  The SAP error message MD751 indicates that a production lot is currently being processed by another user or transaction. This typically occurs in scenarios where multiple users or processes are trying to access or modify the same production lot simultaneously, leading to a lock situation.
  Cause:
  
  Concurrent Access: Another user or process is currently working on the same production lot, which causes a lock on that lot.
  Long-running Transactions: If a transaction is taking a long time to complete, it may hold the lock for an extended period, preventing others from accessing the lot.
  System Configuration: Certain configurations in the system may lead to locks being held longer than necessary.
  
  Solution:
  
  Wait and Retry: If the lock is temporary, waiting for a few moments and then retrying the operation may resolve the issue.
  Identify the Locking User/Process: Use transaction codes like SM12 (to view locks) or SM21 (to check system logs) to identify which user or process is holding the lock on the production lot.
  Communicate with the User: If you identify the user or process, communicate with them to understand if they can release the lock or if they are still actively working on the lot.
  Transaction Monitoring: If the locking process is taking too long, you may need to investigate why it is taking so long and address any performance issues.
  System Configuration Review: Review the system configuration to ensure that locks are being managed appropriately and that there are no unnecessary long locks being held.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes like SM12 (to check for locks), SM21 (system log), and ST22 (dump analysis) for troubleshooting.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  User Training: Ensure that users are trained on how to properly handle production lots to minimize the chances of concurrent access issues.
  
  If the problem persists after trying the above solutions, it may be necessary to involve your SAP Basis team or technical support for further investigation.