How To Fix CNV_DMC_SIN255 - Material &1 already exist

CNV_DMC_SIN255 - Overview

• Message type: E = Error

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

• Message number: 255

• Message text: Material &1 already exist

What causes this issue?

Material already exists. If you want to enhance an already existing
material please use migration object ' Material - extend existing record
by new org levels.

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.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

CNV_DMC_SIN255 - Details

• The SAP error message CNV_DMC_SIN255, which states "Material &1 already exists," typically occurs during data migration or data conversion processes, particularly when using the SAP Data Migration Cockpit (DMC) or similar tools. This error indicates that the system is attempting to create a material that already exists in the database.
  
  Cause:
  
  
  Duplicate Material Creation: The most common cause is that the material number being imported or created already exists in the system. This can happen if:
  
  The data being migrated includes materials that were previously created.
  There is a mismatch in the data being processed, leading to attempts to create the same material multiple times.
  
  
  
  Data Preparation Issues: The source data may not have been adequately cleaned or deduplicated before migration, leading to attempts to create duplicate entries.
  
  
  Incorrect Mapping: If the mapping of fields during the migration process is incorrect, it may lead to the same material being processed multiple times.
  
  
  
  Solution:
  
  
  Check Existing Materials: Before running