How To Fix CNV_DMC_SIN290 - Combination of Material &1, Material Group &2, Vendor &3 must be unique

CNV_DMC_SIN290 - Overview

• Message type: E = Error

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

• Message number: 290

• Message text: Combination of Material &1, Material Group &2, Vendor &3 must be unique

What causes this issue?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

It is not possible to have the same combination of material number,
material group, and vendor's account number on the sheet General Data.
The Legacy Number of the purchasing info record is &V4&.
Further processing of the file is cancelled due to this wrong
combination of material number, material group, and vendor's account
number. The file will only be processed when the combinations are
correct.

How to fix this error?

Aggregate these entries to a unique combination with one Legacy Number
of purchasing info record. You can add several entries to the
subordinate sheet Purchasing Organization Data with this Legacy Number.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

CNV_DMC_SIN290 - Details

• The SAP error message CNV_DMC_SIN290 indicates that there is a uniqueness constraint violation in the data being processed. Specifically, it means that the combination of Material, Material Group, and Vendor must be unique in the context of the operation you are performing, typically during data migration or data conversion processes.
  
  Cause:
  
  Duplicate Entries: The most common cause of this error is that there are duplicate entries in the data being imported or processed. This could happen if the same material, material group, and vendor combination exists more than once in the source data.
  Data Integrity Issues: There may be issues with the integrity of the data being migrated, such as incorrect mappings or transformations that lead to duplicates.
  
  Configuration Issues: Sometimes, the configuration settings in the SAP system may enforce uniqueness constraints that are not being adhered to in the incoming data.
  
  
  Solution:
  
  Identify Duplicates: Review the data being processed to identify any duplicate combinations of