Message type: E = Error
Message class:  CNV_20212_CHECK - Messages for check functions (credit control area conv.) 
Message number: 055
Message text: Implicit merge into target credit control area &1
<DS:TX.CNV_MBT_IMPLICIT_MERGE>Implicit merge</> into target credit
control area &V1&.
If according to the mapping a credit control area is converted to a
credit control area that already exists, these two credit control areas
are merged. If the existing credit control area is not included in the
mapping, this is an <DS:TX.CNV_MBT_IMPLICIT_MERGE>implicit merge</>,
that is, a merge that is not defined directly (explicitly) in the
mapping, but follows implicitly from the mapping and the existing credit
control area.
Example: Credit control area A is renamed into B (mapping: A -> B).
However credit control area B exists already and is not meant to be
changed into another credit control area. This would amount to an
implicit merge of A and B. For these implicit merges, the same checks as
for explicit merges are required (mapping: A -> B; B -> B).
We require that all credit control areas are included in the mapping,
which are part of an identified implicit merge.
Error
You must add credit control area &V1& to the mapping as a source value.
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_CHECK055 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 implicit merging of data into the target credit control area.
Cause: The error message CNV_20212_CHECK055 is generally caused by one of the following issues: Data Inconsistency: There may be inconsistencies in the data being migrated, such as duplicate entries or missing references that prevent the system from correctly merging the data into the target credit control area.
Configuration Issues: The target credit control area may not be properly configured to accept the incoming data, or there may be restrictions in place that prevent the merging of certain records. Mapping Errors: There could be errors in the mapping of source data to target structures, leading to conflicts during the merge process. Missing Master Data: Required master data (like customer or vendor records) may
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