Message type: E = Error
Message class:  FOT_ATR - Adv. Tax Reporting Messages 
Message number: 009
Message text: Mapping tax box &1 to tax group &2 is not allowed
In simple maintenance tax boxes and tax groups must be identical
Data will not be saved
You can only map an identical tax group to the tax box
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 FOT_ATR009 indicates that there is an issue with the mapping of a tax box to a tax group in the system. This error typically arises during the processing of tax-related transactions, such as when generating tax reports or during the posting of financial documents.
Cause: The error occurs when there is an attempt to map a specific tax box (identified by &1) to a tax group (identified by &2) that is not allowed according to the configuration settings in the SAP system. This can happen due to several reasons, including: Incorrect Configuration: The tax box and tax group may not be properly configured in the system. This could be due to missing or incorrect entries in the tax configuration tables. Regulatory Changes: Changes in tax regulations may require updates to the tax mapping, and if these changes are not reflected in the system, it can lead to this error. Data Entry
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