Message type: E = Error
Message class:  CNV_20200_CHECK - Messages for check functions (company code merge) 
Message number: 158
Message text: Duplicate asset numbers will occur for the participating company codes
The participating company codes use same asset numbers. Duplicate asset
numbers will occur for the participating company codes.
One duplicate asset will be: Company code &V1&, Asset Number &V2&
Error
These asset numbers must be renamed in order to keep them unique. You
cannot merge assets. You must therefore specify mapping values or a
renumbering rule.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV_20200_CHECK158 indicates that there is a potential issue with duplicate asset numbers across different company codes during a data migration or conversion process. This error typically arises in the context of the SAP S/4HANA migration or during the use of the SAP Asset Accounting module.
Cause: The error occurs when the system detects that the same asset number is being used for different company codes. In SAP, asset numbers must be unique within a company code. If the same asset number is assigned to multiple company codes, it can lead to inconsistencies and errors in asset accounting.
Solution: To resolve this error, you can take the following steps: Identify Duplicate Asset Numbers: Use transaction codes like SE16 or SE11 to query the asset master data tables (e.g., ANLA, ANLB) to identify which asset numbers are duplicated across company codes. Renumber Assets: If duplicates are found, you will need to renumber the assets in one
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