Message type: E = Error
Message class:  CNV_20200_CHECK - Messages for check functions (company code merge) 
Message number: 215
Message text: Merge into (CoCd &1, CJ business transact. &2) with different customizing
Merge of cash journal business transactions into (Company code &V1&,
Cash Journal Number &V2&) for which the source cash journal business
transactions have different customizing settings.
Error
Provide a suitable mapping for cash journal business transactions.
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.
The SAP error message CNV_20200_CHECK215 typically occurs during data migration or conversion processes, particularly when using SAP's tools for migrating data from legacy systems to SAP S/4HANA or other SAP environments. This error indicates that there is a conflict in the customizing settings for the company code (CoCd) and the business transaction type (CJ business transaction) being processed.
Cause: The error arises when there are inconsistencies in the customizing settings for the specified company code and business transaction type. This can happen due to: Different Customizing Settings: The same business transaction type may have different configurations or settings in different company codes. Data Inconsistencies: The data being migrated may reference business transaction types that are not uniformly defined across the company codes. Missing or Incorrect Configuration: The required customizing settings for the business transaction type may not be properly set up for the company code in question.
Solution: To resolve this error, you can take the following
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CNV_20200_CHECK214 Merge of cash journal business transactions with identical customizing
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