How To Fix CNV_20110021 - In CoAr &2, there is a B segment, but no A segment for CostEl &1.

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_20110 - Pre-analysis for chart of accounts conversion

• Message number: 021

• Message text: In CoAr &2, there is a B segment, but no A segment for CostEl &1.

What causes this issue?

In controlling area &V2&, there is a B segment (table CSKB), but no A
segment (table CSKA) for primary cost element &V1&.

How to fix this error?

Remove this inconsistency by either creating the missing master data
for cost element &V1& or deleting the controlling area-related data for
primary cost element &V1&.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_20110021 - In CoAr &2, there is a B segment, but no A segment for CostEl &1. ?

  The SAP error message CNV_20110021 typically occurs during the data migration process, particularly when using the SAP Conversion and Migration tools. This specific error indicates that there is a B segment (which usually contains detailed information) present in the data for a cost element, but there is no corresponding A segment (which usually contains the header or summary information) for that cost element.
  Cause:
  
  Data Inconsistency: The primary cause of this error is a mismatch or inconsistency in the data being migrated. Specifically, it suggests that the data for a cost element is incomplete, as the A segment is missing while the B segment exists.
  Incorrect Mapping: There may be an issue with how the data is mapped from the source system to the target system, leading to missing segments.
  Data Preparation Issues: If the data was not properly prepared or validated before migration, it could lead to such inconsistencies.
  
  Solution:
  
  Check Data Source: Review the source data to ensure that for every B segment, there is a corresponding A segment. This may involve checking the data extraction process to ensure all necessary information is included.
  Data Mapping Review: Verify the mapping configuration in the migration tool to ensure that all segments are correctly defined and that the A segments are being generated as expected.
  Data Validation: Implement data validation checks before migration to catch such inconsistencies early. This can include running reports or queries to identify missing A segments for any B segments.
  Correct the Data: If you find that A segments are indeed missing, you will need to either create them or adjust the B segments accordingly to ensure that the data is complete and consistent.
  Consult Documentation: Refer to SAP documentation or notes related to the specific migration process you are using, as there may be additional guidance or known issues related to this error.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional troubleshooting steps.
  Migration Tools: Familiarize yourself with the specific migration tools being used (e.g., SAP S/4HANA Migration Cockpit) and their documentation for best practices in data preparation and migration.
  Testing: After making corrections, conduct thorough testing to ensure that the migration process runs smoothly without further errors.
  
  By addressing the root cause of the error and ensuring that the data is complete and correctly mapped, you should be able to resolve the CNV_20110021 error and proceed with your migration successfully.