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

CNV_DMC_SIN299 - Overview

• 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.

CNV_DMC_SIN299 - Details

• 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