Message type: E = Error
Message class:  CNV_20100 - Messageclass for chart of account conversion 
Message number: 165
Message text: CoCd &1 for op. CoA &2 missing; group CoA conversion &3 not possible
For conversion of group chart of accounts &V3&, the following
requirements must be met:
All operative charts of accounts that use group chart of accounts &V3&
participate in the conversion
All company codes of the operative charts of accounts to which group
chart of accounts &V3& is assigned participate in the conversion
The system found that company code &V1&, which uses the operative chart
of accounts &V2&, does not participate in the conversion, though group
chart of accounts &V3& is assigned to operative chart of accounts &V2&.
Either include the missing company code &V1& in the conversion of
operative chart of accounts &V2&, or do not convert group chart of
accounts &V3&.
&ADDITIONAL_HINTS&
The above described prerequites apply because of the way delimitation is
done in this package.
To ensure that the prerequisites are fulfilled, it is sufficient to
include operative chart of accounts &V1& and all company codes of
operative chart of accounts &V1& in the conversion, even if no accounts
or cost elements are changed.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV_20100165 typically occurs during the conversion process in SAP systems, particularly when dealing with the migration of financial data. This error indicates that there is a missing operational Chart of Accounts (CoA) for a specific Company Code (CoCd) and that the group Chart of Accounts conversion is not possible as a result.
Cause: Missing Operational CoA: The operational Chart of Accounts for the specified Company Code is not defined or is missing in the system.
Configuration Issues: There may be configuration issues in the system where the mapping between the operational CoA and the group CoA is not properly set up. Data Migration Issues: During data migration, if the necessary CoA mappings are not established or if there are inconsistencies in the data, this error can occur.
Solution: Check CoA Configuration: Go to the SAP configuration settings and verify that the operational Chart of Accounts is correctly defined for the specified Company Code. Ensure
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