How To Fix DMC_TRANSPORT121 - Force DDIC sync and regeneration of conversion objects

SAP Error Message - Details

• Message type: E = Error

• Message class: DMC_TRANSPORT - DMC: Nachrichten Transportanschluss

• Message number: 121

• Message text: Force DDIC sync and regeneration of conversion objects

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DMC_TRANSPORT121 - Force DDIC sync and regeneration of conversion objects ?

  The SAP error message DMC_TRANSPORT121 typically indicates an issue related to the Data Migration Cockpit (DMC) where there is a need to synchronize the Data Dictionary (DDIC) and regenerate conversion objects. This error can occur during data migration processes, especially when there are inconsistencies or changes in the data structures.
  Cause:
  
  Inconsistent Data Dictionary: The error often arises when there are changes in the data structures (like tables, fields, or data types) that have not been properly synchronized with the Data Migration Cockpit.
  Transport Issues: If there have been recent transports that included changes to the data structures, and these changes have not been reflected in the DMC, it can lead to this error.
  Missing or Outdated Conversion Objects: The conversion objects that are used for data mapping and transformation may be outdated or missing, leading to inconsistencies.
  
  Solution:
  To resolve the DMC_TRANSPORT121 error, you can follow these steps:
  
  
  Force DDIC Sync:
  
  Use transaction code SE11 to access the Data Dictionary.
  Check for any inconsistencies in the data structures.
  If necessary, perform a synchronization of the DDIC by using the appropriate tools or commands.
  
  
  
  Regenerate Conversion Objects:
  
  Go to the Data Migration Cockpit and locate the conversion objects that are causing the issue.
  Regenerate these conversion objects to ensure they are up-to-date with the current data structures.
  This can often be done through the DMC interface or by using specific transaction codes related to the DMC.
  
  
  
  Check Transport Requests:
  
  Review any recent transport requests that may have affected the data structures.
  Ensure that all relevant transports have been successfully imported into the target system.
  
  
  
  Re-run the Migration:
  
  After performing the above steps, re-run the data migration process to see if the error persists.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may address this specific error. There may be patches or updates that can resolve underlying issues.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes like SE11 (Data Dictionary), SE09/SE10 (Transport Organizer), and DMC-related transactions.
  SAP Documentation: Review the official SAP documentation for the Data Migration Cockpit for best practices and troubleshooting steps.
  Community Forums: Engage with SAP community forums or support channels for additional insights and shared experiences from other users who may have encountered the same error.
  
  By following these steps, you should be able to resolve the DMC_TRANSPORT121 error and ensure a smooth data migration process.