How To Fix MDRD001 - Lock on table &1 could not be set for MRP area &2

SAP Error Message - Details

• Message type: E = Error

• Message class: MDRD - Messages for Delivery Relationships

• Message number: 001

• Message text: Lock on table &1 could not be set for MRP area &2

What causes this issue?

The system could not lock table MDRD (delivery relationships). This
could be due to a process that is currently running, or because a user
is currently processing a requested record.

System Response

The system cannot determine or delete delivery relationships for the
whole MRP area.

How to fix this error?

Release all locked records for the requested MRP area and restart the
program.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MDRD001 - Lock on table &1 could not be set for MRP area &2 ?

  The SAP error message MDRD001 indicates that there is a lock issue on a specific table related to the MRP (Material Requirements Planning) area. This error typically occurs when the system is unable to set a lock on the specified table for the given MRP area, which can prevent certain operations from being completed.
  Cause:
  
  Concurrent Access: The most common cause of this error is that another user or process is currently accessing the same MRP area or table, which prevents the system from acquiring the necessary lock.
  Long-running Transactions: If a transaction is taking too long to complete, it may hold the lock longer than expected, causing other processes to fail when trying to access the same data.
  Database Issues: There may be underlying database issues, such as deadlocks or performance problems, that prevent the lock from being set.
  Configuration Issues: Incorrect configuration of the MRP area or related settings may also lead to locking issues.
  
  Solution:
  
  Check for Active Sessions: Use transaction codes like SM12 (to view and manage locks) to check if there are any active sessions holding locks on the table. If you find any unnecessary locks, you can release them if appropriate.
  Wait and Retry: If the lock is held by a legitimate process, you may need to wait for that process to complete before retrying your operation.
  Review Long-running Transactions: Identify any long-running transactions that may be causing the lock and address them. This may involve optimizing the transaction or breaking it into smaller parts.
  Database Monitoring: Check the database for any performance issues or deadlocks. You may need to work with your database administrator to resolve these issues.
  Configuration Review: Review the configuration of the MRP area and related settings to ensure they are set up correctly.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes like SM12 (to view locks), SM21 (to check system logs), and ST22 (to check dumps) for troubleshooting.
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  User Documentation: Review SAP documentation related to MRP and locking mechanisms to better understand how locks are managed in the system.
  
  If the issue persists after trying the above solutions, it may be necessary to involve your SAP Basis team or SAP support for further investigation.