Check the provincial tax code in tax code 2 (nnnnnnnxxxn)

What causes this issue?

Positions 8, 9, and 10 of the 11-character Italian tax number contain a
provincial tax code. Positions 8, 9, and 10 of the tax number 2 entered
do not correspond to this provincial code defined for region &V1&.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Check positions 8, 9 and 10 of the tax number 2 entered. If necessary,
also check the entry in the 'Region' field.

Error message extract from SAP system. Copyright SAP SE.