Enter Same Tax Registration Number in Profile and Addresses

Hi all,

Getting an error when attempting to enter for the same supplier tax registration number that is in Profile tab into the addresses tab.

As an example, we are getting from supplier portal the below information that is populated into the Profile Tab in Supplier:

As you can see, in Transaction Tax we can see country and Registration Number. We want this information to be also in the Addresses tab. So when I go there to add this information as below:

an error comes up when I click save:

Are we missing something or doing this wrong? Why can't we have the profile level registration also be available in the Addresses for the same supplier?