How To Fix NRSCNV389 - Only 1:1 mapping with replaced compound is allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: NRSCNV - Message class

• Message number: 389

• Message text: Only 1:1 mapping with replaced compound is allowed

What causes this issue?

You want to replace a compounding InfoObject.

System Response

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

How to fix this error?

If any of these requirements are not met, modify the operation
accordingly or select another InfoObject 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 NRSCNV389 - Only 1:1 mapping with replaced compound is allowed ?

  The SAP error message NRSCNV389, which states "Only 1:1 mapping with replaced compound is allowed," typically occurs during the process of data migration or conversion, particularly when dealing with the mapping of compound data types in SAP systems. This error indicates that there is an issue with how the data is being mapped from one structure to another, specifically when it involves compound types that have been replaced or modified.
  Cause:
  
  
  Compound Data Types: The error usually arises when there is an attempt to map a compound data type (like a structure or a table) to another compound type in a way that does not adhere to the 1:1 mapping requirement. This means that each element in the source must correspond directly to a single element in the target.
  
  
  Incorrect Mapping Configuration: If the mapping configuration is set up incorrectly, such as trying to map multiple source elements to a single target element or vice versa, this error can occur.
  
  
  Data Model Changes: Changes in the data model, such as the replacement of compound types, can lead to inconsistencies in how data is expected to be mapped.
  
  
  Solution:
  
  
  Review Mapping Configuration: Check the mapping configuration in the data migration or conversion tool you are using. Ensure that each source element is mapped to exactly one target element.
  
  
  Adjust Data Structures: If you are using custom structures or have modified standard ones, ensure that the changes are reflected correctly in the mapping. You may need to revert to the original structure or adjust the mapping to accommodate the changes.
  
  
  Use Correct Data Types: Ensure that the data types being used in the mapping are compatible. If you are replacing a compound type, make sure that the new type can be mapped 1:1 with the old type.
  
  
  Consult Documentation: Refer to SAP documentation or notes related to the specific migration or conversion process you are working on. There may be specific guidelines or best practices for handling compound types.
  
  
  Testing: After making adjustments, perform tests to ensure that the mapping works as expected without triggering the error.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional context on handling compound types during data migration.
  Data Migration Tools: Familiarize yourself with the data migration tools being used (like SAP S/4HANA Migration Cockpit, LSMW, etc.) and their specific requirements for mapping.
  Community Forums: Engage with SAP community forums or support channels where similar issues may have been discussed, as other users may have encountered and resolved the same error.
  
  By following these steps, you should be able to identify the root cause of the NRSCNV389 error and implement a solution to resolve it.