Message type: E = Error
Message class:  CNV_DMC_SIN - Messages for s-innovations migration 
Message number: 272
Message text: Tax Number for tax category: &1 already exists
With this object you can only add new tax numbers with new tax
categories. You can't change already existing entries.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Delete these records from the template or change your mapping.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV_DMC_SIN272 indicates that there is a duplicate tax number for a specific tax category in the system. This error typically arises during data migration or conversion processes, particularly when using the SAP Data Migration Cockpit or similar tools.
Cause: The error occurs when: A tax number that is being imported or created already exists in the system for the specified tax category. There may be a mismatch in the data being migrated, leading to duplicate entries. The data source may contain multiple entries for the same tax number and tax category combination.
Solution: To resolve this error, you can take the following steps: Identify Duplicates: Check the source data for duplicates. Ensure that the tax numbers for the specified tax category are unique. Use transaction codes like SE16 or SE11 to query the relevant tables (e.g., T007 for tax categories) to find existing entries. Data Cleansing: Clean the source data to remove or consolidate duplicate tax numbers before
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