How To Fix CNV_40301003 - New acct. det. &2 exists already; implicit merge by acct. det. rename

CNV_40301003 - Overview

• Message type: E = Error

• Message class: CNV_40301 - Message class for package 40301 (KTOGR)

• Message number: 003

• Message text: New acct. det. &2 exists already; implicit merge by acct. det. rename

What causes this issue?

When the asset account determinations that you plan to merge were
checked, it was found that the new asset account determination &V2&
(mapping &V1& -> &V2&) already exists in the database.
However the new asset account determination &V2& is not used as an old
asset account determination ( &V2& -> XXXX) for another mapping
relation.
This means that asset account determination &V1& is in fact merged with
the existing asset account determination &V2&.
This has the following consequences. You need:
to find out if the implicit merge is correct from a logical point of
view
to explicitely include the entry &V2& -> &V2& to the mapping to consider
the priority indicator. If the priority indicator is not set, it is not
clear which settings will take priority when asset account determination
&V1& and &V2& are merged into &V2&.

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

How to fix this error?

<ZH>Regarding item 2:</>
Explicitely include the mapping &V2& -> &V2& into the mapping table so
that at least the following entries exist in the mapping table:
&V1& -> &V2&
&V2& -> &V2&
If applicable, any other mapping with new asset account determination
&V2&.
<ZH>Regarding item 3:</>
Set the priority indicator for one of the entries for which &V2& is the
new asset account determination.
&NOTE&
It is possible to do the conversion without setting the priority
indicator. However then it is undefined which old asset account
determinatiion settings the new asset account determination &V2& will
get.
In this case you should check the asset account determination settings
(transaction XXXX) for the relevant asset account determination class
&V2&
after the conversion.
&ADDITIONAL_HINTS&
The priority indicator must not be set more than <ZH>once</> for all
merges to a given asset account determination.

Error message extract from SAP system. Copyright SAP SE.

CNV_40301003 - Details

• The SAP error message CNV_40301003 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 attempt to create a new account determination (accounting entry) that already exists in the system, leading to an implicit merge operation.
  
  Cause:
  The error arises when:
  
  You are trying to create a new account determination entry that has the same key or identifier as an existing entry in the system.
  The system detects a conflict between the new account determination and an existing one, which leads to the implicit merge process being triggered.
  
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Existing Account Determinations:
  
  Review the existing account determination entries in the system to identify the conflicting entry. You can do this by navigating to the relevant configuration area in SAP (e.g., transaction codes like OBYC for automatic account determination).
  
  
  
  Modify the New Entry:
  
  If