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

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_40300018 - New asset class &2 exists already; implicit merge by class rename ?

  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 to see if the asset class you are trying to create already exists. You can do this by navigating to the Asset Accounting (FI-AA) module and reviewing the asset class configuration.
  
  
  Rename or Merge Asset Classes: If the asset class already exists and you need to keep both, consider renaming the new asset class or merging the data into the existing class, depending on your business requirements.
  
  
  Adjust Migration Data: Modify the migration data to ensure that it does not attempt to create an asset class that already exists. This may involve changing the identifiers in the source data or adjusting the mapping in the migration tool.
  
  
  Consult Documentation: Review the documentation for the migration tool you are using (e.g., SAP S/4HANA Migration Cockpit) to understand how it handles asset classes and any specific configurations that may be required.
  
  
  Testing: After making adjustments, perform a test migration to ensure that the error does not occur again.
  
  
  Related Information:
  
  Transaction Codes: You can use transaction codes like OAOA (for asset class configuration) to view and manage asset classes.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on handling asset classes during migration.
  Migration Tools: Familiarize yourself with the specific migration tools and their settings, as they may have options for handling duplicate asset classes.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP support team or a consultant who specializes in SAP data migration.