Diagnosis
You entered a tax code which is not defined for the country of thecompany code to be posted to in the tax calculation procedure.
INCLUDE FI_NA_CUST
Check whether the company code is assigned to the correct country andwhether the correct tax calculation procedure has been entered for thecompany code country.
Create a new tax code if necessary.

Caution:
Since it is possible that the tables in question are being updated at adifferent time on another computer, it can take a certain amount oftime for the tax code to be on all local machines in client serverarchitectures after saving the new code.