How to manage a customer with 2 Tax Registration Numbers?

Summary:

The customer of our client, based in Germany, has multiple ship-to sites: one in Belgium and one in Germany.

When our client delivers goods to Belgium, they need to use the Belgian Tax Registration Number.

When delivering to Germany, the German Tax Registration Number must be used.

However, when our client generates the reports Financial Tax Register and Generate JPK VAT File for Poland, only the Tax Registration number defined as Default Registration at the party level is identified in the report.

We have tried the following ways, but the result remains the same:

• register 2 Tax Registration number at the party level, and the Registration number of Belgium is set as Default Registration.