The symptom is the same as in Note 119680: Other terms
In the master data of a sold-to party, for each country a VAT registration number can be stored.When you create a billing document, the system should select the VAT registration number of the sold-to party which is relevant for the destination country of the billing document.
VF01 VF02 LV60AF0K LAND1, UIN, tax number, KNAS, STCEG Reason and Prerequisites
VAT registration number, UST-ID
The note is only relevant if the system should use the tax indicatorsand the tax number of the sold-to party and not that of the ship-to party or payer in the billing document. Solution
https://service.sap.com/sap/support/notes/434562 (SAP Service marketplace login required)