Message type: E = Error
Message class:  CNV_20100 - Messageclass for chart of account conversion 
Message number: 265
Message text: CoA merge: Implicit merge of secondary cost element &1 with G/L acct &2
The system found that according to the mapping secondary cost element
&V1& will be changed into &V3&. However there is a G/L account &V2&
which will also be converted into &V3&.
This amounts to an implicit merge of secondary cost element &V1& and G/L
account &V2&, which is not allowed.
The conversion cannot be executed.
The mapping table must be changed accordingly.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV_20100265 indicates an issue during the conversion process related to the merging of secondary cost elements with General Ledger (G/L) accounts. This typically occurs in the context of data migration or system conversion, particularly when using the SAP S/4HANA Migration Cockpit or similar tools.
Cause: The error message suggests that there is an implicit merge happening between a secondary cost element and a G/L account. This can occur due to several reasons: Data Inconsistency: There may be inconsistencies in the mapping of cost elements to G/L accounts, leading to conflicts during the merge process.
Configuration Issues: The configuration settings for cost elements and G/L accounts may not align properly, causing the system to attempt an implicit merge that is not valid. Duplicate Entries: There may be duplicate entries for cost elements or G/L accounts in the system, which can lead to confusion during the merging process.
Solution: To resolve this error, you can
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