How To Fix NRSCNV353 - Only 1:1 mapping with replaced char. is allowed when modifiyng key fields

SAP Error Message - Details

• Message type: E = Error

• Message class: NRSCNV - Message class

• Message number: 353

• Message text: Only 1:1 mapping with replaced char. is allowed when modifiyng key fields

What causes this issue?

You are trying to replace a key field.

System Response

This is not possible. Make sure that the following requirements are met:
The data type and length of the characteristic replacing the previous
characteristic must match
The only filling method allowed is 1:1 mapping with previous
characteristic

How to fix this error?

If one of these requirements is not met, adjust the operation
accordingly or select another characteristic as a replacement.

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 NRSCNV353 - Only 1:1 mapping with replaced char. is allowed when modifiyng key fields ?

  The SAP error message NRSCNV353 indicates that there is an issue with the mapping of key fields during a data conversion or migration process. This error typically arises when you are trying to modify key fields in a way that does not adhere to the 1:1 mapping requirement, particularly when using replaced characters.
  Cause:
  
  1:1 Mapping Requirement: The error suggests that the system expects a one-to-one mapping for the key fields being modified. This means that each original key value must correspond to exactly one new key value.
  Replaced Characters: If you are using replaced characters (e.g., special characters or placeholders) in the key fields, the system may not be able to establish a clear mapping, leading to this error.
  Data Integrity Issues: There may be issues with the integrity of the data being migrated or converted, such as duplicates or missing values that violate the mapping rules.
  
  Solution:
  
  Review Key Field Modifications: Ensure that any modifications to key fields maintain a strict 1:1 relationship. Each original key value should map to a unique new key value without any ambiguity.
  Check for Replaced Characters: If you are using replaced characters, verify that they are being used correctly and that they do not introduce any conflicts or duplicates in the key field values.
  Data Validation: Perform a thorough validation of the data being processed. Check for duplicates, missing values, or any inconsistencies that could lead to mapping issues.
  Adjust Mapping Logic: If necessary, adjust the mapping logic in your data migration or conversion process to ensure compliance with the 1:1 mapping requirement.
  Consult Documentation: Refer to SAP documentation or guides related to data migration and key field modifications for specific instructions and best practices.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on handling key field modifications.
  Data Migration Tools: If you are using specific SAP tools for data migration (like LSMW, SAP Data Services, etc.), consult the documentation for those tools to understand how they handle key field mappings.
  Testing: Before executing large-scale data migrations, conduct tests with a smaller dataset to identify potential issues and ensure that the mapping works as expected.
  
  By following these steps, you should be able to resolve the NRSCNV353 error and successfully modify the key fields in your SAP system.