Message type: E = Error
Message class:  TAX_MAPEXTFLD - External Tax - Map Extension Fields 
Message number: 003
Message text: Field '&1' does not exist in table '&2'
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The SAP error message TAX_MAPEXTFLD003 indicates that a specific field (denoted as &1) does not exist in the specified table (denoted as &2). This error typically arises in the context of tax mapping or when working with tax-related configurations in SAP.
Cause: Field Name Typo: The field name specified in the error message may have been misspelled or incorrectly referenced in the configuration or code. Table Structure Changes: The table structure may have changed due to updates or modifications in the SAP system, leading to the field being removed or renamed. Incorrect Configuration: The configuration settings for tax mapping may be incorrect, pointing to a field that is not part of the specified table. Custom Development: If there are custom developments or enhancements, they may reference fields that do not exist in the standard table.
Solution: Verify Field and Table Names: Check the field name (&1) and the table name (&2) in the SAP Data Dictionary (transaction
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