How To Fix CNV_DMC_SIN511 - Duplicate entries for material &1 and vendor &2 are not allowed

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 511

• Message text: Duplicate entries for material &1 and vendor &2 are not allowed

What causes this issue?

The combination of material number and vendor's account number must be
unique in the complete file. This record will be skipped. Material
number &V1& and vendor's account number &V2& are already within legacy
number &V3& in your file.

System Response

How to fix this error?

Remove the duplicate entries with the combination of material number and
vendor's account number from the file.

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 CNV_DMC_SIN511 - Duplicate entries for material &1 and vendor &2 are not allowed ?

  The SAP error message CNV_DMC_SIN511 indicates that there are duplicate entries for a specific material and vendor combination in the system. This error typically arises during data migration or data upload processes, particularly when using the SAP Data Migration Cockpit or similar tools.
  
  Cause:
  The error occurs when:
  
  
  Duplicate Data: The data being uploaded or migrated contains multiple entries for the same material and vendor combination. This could be due to:
  
  Errors in the source data.
  Incorrect data preparation or transformation processes.
  Multiple records in the source system that were not properly deduplicated.
  
  
  
  Data Integrity Constraints: The SAP system enforces data integrity rules that prevent the creation of duplicate entries for certain key fields, such as material and vendor.
  
  
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Identify Duplicates:
  
  Review the data file or source system to identify the duplicate entries for the specified material and vendor.
  Use tools like Excel or SQL queries to find duplicates based on