How To Fix CNV_DMC_SIN299 - Material Forecast Data for Plant: &1 already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_DMC_SIN - Messages for s-innovations migration

• Message number: 299

• Message text: Material Forecast Data for Plant: &1 already exists

What causes this issue?

Within this migration object you can only extend new plant specific
forecasting data. You can't change already existing entries.

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?

Delete these records from the template/staging table.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_DMC_SIN299 - Material Forecast Data for Plant: &1 already exists ?

  The SAP error message CNV_DMC_SIN299 indicates that there is an attempt to create or import material forecast data for a specific plant that already exists in the system. This error typically arises during data migration or data import processes, particularly when using tools like SAP Data Migration Cockpit or SAP S/4HANA Migration.
  Cause:
  The primary cause of this error is that the system has detected that the forecast data for the specified material and plant combination is already present in the database. This can happen due to:
  
  Duplicate entries in the data being imported.
  Previous migration attempts that were not fully cleaned up.
  Incorrect data preparation or mapping before the import.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Existing Data:
  
  Verify if the forecast data for the specified material and plant already exists in the system. You can do this by using transaction codes like MD04 (Stock/Requirements List) or MD61 (Maintain Forecast).
  
  
  
  Remove Duplicates:
  
  If you find that there are duplicate entries in your import file, remove them to ensure that each material and plant combination is unique.
  
  
  
  Update Existing Data:
  
  If you need to update the existing forecast data instead of creating new entries, modify your import file accordingly. Ensure that the data reflects the changes you want to make.
  
  
  
  Data Cleanup:
  
  If there are remnants of previous migration attempts, consider cleaning up the existing data before re-attempting the import. This may involve deleting or archiving old forecast data.
  
  
  
  Consult Documentation:
  
  Review the SAP documentation related to the data migration process you are using. There may be specific guidelines or best practices for handling forecast data.
  
  
  
  Error Logs:
  
  Check the error logs for more detailed information about the error. This can provide insights into what specific data is causing the issue.
  
  
  
  Testing:
  
  Before performing a full migration, conduct a test migration with a smaller dataset to ensure that the process works without errors.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MD04, MD61, and MD62 for managing forecast data.
  SAP Notes: Look for SAP Notes related to data migration and the specific error message for any patches or updates that may address the issue.
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the CNV_DMC_SIN299 error and successfully manage your material forecast data in SAP.