One expense types setid, two different BUs and VAT requirements

Hello.

This is my first question here.

We have PS Fin 9.2 (8.57 tools).

Now, we have expense types for UK set up under ENSHR. And VAT Entity for all UK business units is also under one setid.

One of UK BUs requires to not have VAT on their expenses, and the other ones need VAT.

How to achieve that? Even though we set up that BU VAT Defaults to Exempt system is still calculating VAT for expense types which have some VAT defaults set up due to lower VAT rates required.

Is that even possible?

Below is VAT Defaults setup for that one BU that does not require VAT.