Message type: E = Error
Message class:  CNV_20110 - Pre-analysis for chart of accounts conversion 
Message number: 020
Message text: In CoCd &2, there is a B segment, but no A segment for G/L account &1
In company code &V2&, there is a B segment (table SKB1), but no A
segment (table SKA1) for G/L account &V1&.
Remove this inconsistency by either creating the missing master data or
deleting the company code-related data for G/L account &V1&.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV_20110020 indicates that there is a discrepancy in the data migration process, specifically related to the General Ledger (G/L) accounts during a conversion or migration project. This error typically arises when the system finds a B segment (which usually contains balance data) for a G/L account in a specific company code (CoCd), but it does not find a corresponding A segment (which contains master data) for that same G/L account.
Cause: Missing Master Data: The A segment, which contains the master data for the G/L account, is missing. This could happen if the data migration process did not include the creation of the A segment for the G/L account before the B segment was created. Data Migration Issues: There may have been issues during the data migration process, such as incorrect mapping or incomplete data extraction from the legacy system. Configuration Errors: There might be configuration issues in the SAP
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