How To Fix CNV_20100215 - CoA merge: Source cost element &1 exists; implicit merge by CostEl rename

CNV_20100215 - Overview

• Message type: E = Error

• Message class: CNV_20100 - Messageclass for chart of account conversion

• Message number: 215

• Message text: CoA merge: Source cost element &1 exists; implicit merge by CostEl rename

What causes this issue?

When checking the cost elements that will be merged, the system found
that target cost element &V1& will be converted into &V2& (mapping &V1&
-> &V2&).
Another source cost element &V3& exists already in the database and will
also be transferred to target cost element &V2& as a consequence of the
chart of accounts change.
This means that cost element &V1& will implicitly be merged with
existing cost element &V3& at <DS:TX.CNV_20100_TX_ASEGMENT>A level</> as
well as at <DS:TX.CNV_20100_TX_BSEGMENT>B level</>.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

This has the following cnsequences. You need:
to find out if the implicit merge is correct from a logical point of
view
to explicitely include the entry &V3& -> &V2& to the mapping
consider the priority indicator. If the priority indicator is not set,
it is not clear which settings will take priority when cost elements
&V1& and &V3& are merged into &V2&

How to fix this error?

<ZH>Regarding item 2:</>
Explicitely include the mapping &V3& -> &V2& in the mapping table so
that at least the following entries exist in the mapping table:
&V1& -> &V2&
&V3& -> &V2&
If necessary, any others with target account &V2&.
This allows the system to check the merge for logical correctness.
A troubleshooting activity is associated to this activity which supports
you in creating the required mapping entries to resolve the implicit
merges.
<ZH>Regarding item 3:</>
Set the priority indicator for one of the entries with target cost
element &V2&.
&NOTE&
It is possible to do the conversion without setting the priority
indicator. In this case you should check the A segment settings (master
data in chart of accounts) as well as the B segment settings (master
data in controlling area, transaction KA02) for the cost element &V2&
after the conversion.
&ADDITIONAL_HINTS&
The priority indicator must not be set more than <ZH>once</> for all
merges to a given target account. This is also valid for cross-charts of
accounts merges.

Error message extract from SAP system. Copyright SAP SE.

CNV_20100215 - Details

• The SAP error message CNV_20100215 is related to the Cost Element (CoA) merge process during a migration or conversion project, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error indicates that there is a conflict with the source cost element during the merge process, specifically that the source cost element already exists in the target system.
  
  Cause:
  The error occurs when:
  
  You are trying to merge cost elements from a source chart of accounts (CoA) into a target CoA.
  The source cost element you are trying to merge already exists in the target CoA.
  The system attempts an implicit merge by renaming the cost element, which may not be the desired outcome.
  
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Existing Cost Elements:
  
  Review the target CoA to identify the existing cost element that is causing the conflict. You can do this by navigating to the relevant transaction codes (e.g., KS01