How To Fix CNV_40300018 - New asset class &2 exists already; implicit merge by class rename

CNV_40300018 - Overview

• Message type: E = Error

• Message class: CNV_40300 - Message class for package 40300 (ANLKL)

• Message number: 018

• Message text: New asset class &2 exists already; implicit merge by class rename

What causes this issue?

When the asset classes that you plan to merge were checked, it was found
that new asset class &V2& (mapping &V1& -> &V2&) already exists in the
database.
However the new asset class &V2& is not used as an old asset class (
&V2& -> XXXX) for another mapping relation.
This means that asset class &V1& is in fact merged with the existing
asset class &V2&.

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 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 class &V1& and &V2&
are merged into &V2&.

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 the new asset class &V2&.
<ZH>Regarding item 3:</>
Set the priority indicator for one of the entries for which &V2& is the
new asset class.
&NOTE&
It is possible to do the conversion without setting the priority
indicator. However then it is undefined which old asset class settings
the new asset class &V2& will get. In this case you should check the
asset class settings (transaction OAOA) for the relevant asset 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 class.

Error message extract from SAP system. Copyright SAP SE.

CNV_40300018 - Details

• The SAP error message CNV_40300018 indicates that there is a conflict with asset classes during a data migration or conversion process. Specifically, it means that a new asset class you are trying to create already exists in the system, and SAP is attempting to handle this by implicitly merging the classes through a class rename.
  
  Cause:
  
  Duplicate Asset Class: The asset class you are trying to create already exists in the system. This can happen if the migration process is trying to create an asset class that has the same identifier as an existing one.
  Data Migration Issues: During data migration, if the source system has asset classes that conflict with those in the target system, this error can occur.
  
  Configuration Issues: There may be inconsistencies in the configuration of asset classes between the source and target systems.
  
  
  Solution:
  
  
  Check Existing Asset Classes: Before running the migration, check the existing asset classes in the target system