Message type: E = Error
Message class:  CNV_20212_CHECK - Messages for check functions (credit control area conv.) 
Message number: 258
Message text: No implicit merges of credit control areas
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The SAP error message CNV_20212_CHECK258 with the description "No implicit merges of credit control areas" typically occurs during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error indicates that there is an issue with the credit control areas in the system, specifically that the system does not allow for implicit merging of credit control areas during the migration process.
Cause: Credit Control Area Configuration: The error arises when the migration process attempts to merge or consolidate data from different credit control areas that are not compatible or do not meet the necessary criteria for merging. Data Inconsistencies: There may be inconsistencies in the data related to customer credit management, such as different credit limits or risk categories assigned to customers in different credit control areas. Business Rules: SAP enforces certain business rules that prevent the automatic merging of credit control areas to ensure data integrity
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