How To Fix MC686 - ENQUEUE functions could not be deleted

SAP Error Message - Details

• Message type: E = Error

• Message class: MC - Aggregate: views, matchcodes, lock objects

• Message number: 686

• Message text: ENQUEUE functions could not be deleted

What causes this issue?

Function modules ENQUEUE_... and DEQUEUE_... are newly generated when a
lock object is activated.
An error occurred when deleting the old version.

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?

In order to find out why the function modules could not be deleted, you
should try to delete the function modules manually as user DDIC.
Caution: Function modules of function group SENQ should never be
manipulated manually. A syntax error in this function group makes most
of the base functions unusable (including the Editor) !

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MC686 - ENQUEUE functions could not be deleted ?

  The SAP error message MC686 ("ENQUEUE functions could not be deleted") typically occurs in the context of the Material Management (MM) module, particularly when dealing with the enqueue and dequeue functions that manage locks on objects in the SAP system. This error can arise due to various reasons, including issues with the database, inconsistencies in the lock table, or problems with the enqueue server.
  Causes:
  
  Lock Table Issues: The lock table may be full or corrupted, preventing the deletion of enqueue functions.
  Database Issues: There may be underlying database issues that are causing the enqueue functions to not be deleted properly.
  System Configuration: Incorrect configuration of the enqueue server or related parameters can lead to this error.
  User Authorizations: The user may not have the necessary authorizations to delete the enqueue functions.
  System Load: High system load or performance issues can also lead to problems with enqueue and dequeue operations.
  
  Solutions:
  
  Check Lock Table: Use transaction code SM12 to check the lock entries. If there are unnecessary locks, you can delete them if you have the necessary authorizations.
  Restart Enqueue Server: If the enqueue server is not functioning properly, restarting it can sometimes resolve the issue. This can be done through transaction SM51 or by using the SAP Management Console.
  Check System Logs: Use transaction SM21 to check the system logs for any related errors or warnings that might provide more context on the issue.
  Database Consistency Check: Perform a database consistency check to ensure that there are no underlying issues with the database that could be causing the problem.
  User Authorizations: Ensure that the user has the necessary authorizations to perform enqueue and dequeue operations.
  System Performance: Monitor system performance and load. If the system is under heavy load, consider optimizing performance or scheduling heavy tasks during off-peak hours.
  
  Related Information:
  
  Transaction Codes:
  
  SM12: To view and manage lock entries.
  SM21: To view system logs.
  SM51: To manage application servers.
  
  
  SAP Notes: Check for relevant SAP Notes in the SAP Support Portal that may address this specific error or provide patches and updates.
  Documentation: Review SAP documentation related to enqueue and dequeue processes for more detailed information on how these functions work and how to troubleshoot related issues.
  
  If the problem persists after trying the above solutions, it may be necessary to contact SAP support for further assistance.