Message type: E = Error
Message class:  CNV_20100 - Messageclass for chart of account conversion 
Message number: 462
Message text: G/L account &1 &2 was newly created
G/L account &V1& &V2& was newly created (in table SKA1).
This G/L account is missing from the corresponding backup table and was
not covered by the mapping check.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Check if this has an impact on the chart of accounts conversion.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV_20100462 indicates that a General Ledger (G/L) account has been newly created during a data migration or conversion process. This message typically arises in the context of using SAP's Migration Cockpit or during data transfer activities, particularly when migrating financial data from legacy systems to SAP S/4HANA or other SAP environments.
Cause: The error occurs when the system detects that a G/L account referenced in the migration data does not exist in the target system. This can happen for several reasons: The G/L account was not included in the migration data. The G/L account was created after the migration data was prepared. There may be inconsistencies in the mapping of accounts between the source and target systems.
Solution: To resolve this error, you can take the following steps: Verify G/L Account Creation: Check if the G/L account mentioned in the error message has indeed been created in the target system. If it has not been
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