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

MDG_MDF405 - Overview

• 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