How To Fix MDG_MDF405 - DDIC structures already being generated by user &1

SAP Error Message - Details

• Message type: E = Error

• Message class: MDG_MDF - Master Data: Messages

• Message number: 405

• Message text: DDIC structures already being generated by user &1

What causes this issue?

The database tables and structures must be regenerated. User &V1& has
already started the generation. This activity can take several minutes.

System Response

Processing is terminated.

How to fix this error?

Wait a while and then start the function again.

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 MDG_MDF405 - DDIC structures already being generated by user &1 ?

  The SAP error message MDG_MDF405 indicates that there is an issue with the Data Dictionary (DDIC) structures in the Master Data Governance (MDG) environment. Specifically, the message states that DDIC structures are already being generated by a user, which typically means that there is a concurrent process or user that is already working on generating the same structures.
  Cause:
  
  Concurrent Execution: Another user or process is already executing the generation of DDIC structures for the same Master Data Governance (MDG) object.
  Locking Mechanism: SAP uses a locking mechanism to prevent multiple processes from modifying the same data simultaneously. If one process is already generating DDIC structures, another process will be blocked until the first one completes.
  Long Running Process: The process that is generating the DDIC structures may be taking longer than expected, causing other attempts to generate the same structures to fail.
  
  Solution:
  
  Check for Active Processes: Use transaction codes like SM66 (Global Work Process Overview) or SM50 (Process Overview) to check if there are any active processes that are currently generating DDIC structures. If you find such a process, you may need to wait for it to complete.
  Identify the User: The error message includes the user ID (&1). You can identify the user and check if they are still working on the generation process.
  Wait and Retry: If you find that another user is indeed generating the structures, you may need to wait until that process is completed before trying again.
  Check for Locks: You can also check for locks using transaction SM12 to see if there are any locks related to the DDIC structures that might be causing the issue.
  System Logs: Review system logs for any additional information that might help diagnose the issue further.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes like SE11 (Data Dictionary), SE14 (Database Utility), and SE37 (Function Builder) for managing DDIC objects.
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional troubleshooting steps.
  Documentation: Review the official SAP documentation for Master Data Governance to understand the processes involved in generating DDIC structures.
  
  If the issue persists after following these steps, consider reaching out to your SAP Basis team or SAP support for further assistance.