Message type: E = Error
Message class:  CNV_20212_CHECK - Messages for check functions (credit control area conv.) 
Message number: 010
Message text: Participating credit control areas have different currencies
The participating credit control areas have different currencies.
Warning
Note that the system uses the settings form 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). In
addition, you must re-create the credit control data after the merge by
using report RFDKLI10.
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_CHECK010 indicates that there is a mismatch in the currencies of participating credit control areas during a data migration or conversion process. This error typically arises when you are trying to migrate or convert financial data that involves multiple credit control areas, and those areas are set up with different currencies.
Cause: Different Currencies: The primary cause of this error is that the credit control areas involved in the transaction or data migration are configured with different currencies. For example, one credit control area may be set to USD while another is set to EUR.
Configuration Issues: There may be inconsistencies in the configuration of the credit control areas in the SAP system. Data Migration: During data migration, if the source data contains entries that reference multiple credit control areas with different currencies, this error can occur.
Solution: Check Configuration: Review the configuration of the credit control areas in the SAP system.
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