3099635 - Error FF731 when directly posting to a tax account

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Error message FF731 is raised when you directly post to a tax account using app Post General Journal Entries.

SAP S/4HANA Cloud

1. You would like to post a journal entry in which you post directly to a tax account;
2. Error message FF731 is raised on simulating or posting.

One of reasons for this issue is that tax code definition is incorrect for direct tax account posting.
Like below as an example of incorrect definition, tax code contains more than one activated tax rate.
In SSCUI 101016 - Define Tax Codes for Sales and Purchases

For a direct posting to a tax account, it is only allowed to use a tax code with only one activated tax rate.
Otherwise error message FF731 will be raised.

870090 - FF732, FF731 at direct tax account postings
2891150 - Error FF731 although tax code definition is correct

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