Message type: E = Error
Message class:  CNV_20212_CHECK - Messages for check functions (credit control area conv.) 
Message number: 012
Message text: Participating credit control areas have different fiscal year variants
The participating credit control areas have different fiscal year
variants.
Warning.
Note that the system uses the settings from the reference credit control
area. After the company code, merge you must check the Customizing
settings for the credit control areas (table T001, T001CM and T014).
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_20212_CHECK012 indicates that there is a mismatch in the fiscal year variants between participating credit control areas during a data migration or conversion process. This error typically arises in scenarios where financial data is being consolidated or migrated from different company codes or credit control areas that have different fiscal year settings.
Cause: The primary cause of this error is that the credit control areas involved in the transaction or migration have different fiscal year variants defined in the system. Each fiscal year variant can have different start and end dates, which can lead to inconsistencies when trying to process transactions that span across these areas.
Solution: To resolve this error, you can take the following steps: Check Fiscal Year Variants: Go to the SAP transaction code OB29 to view the fiscal year variants assigned to the credit control areas involved. Ensure that the fiscal year variants for all participating credit control areas
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