VAT Non-recoverable Tax Code issue

Hello,

We have set up 2 VAT Non-recoverable Tax Code for our Denmark users:

All our Suppliers are set up with BU = 1. When a voucher is created for Co 2532 the BU field in the header defaults to the BU of the Supplier in AB, which is 1. In the detail lines, when we enter Tax Expl = V and either of the two tax codes above, the system ignores the PT AAIs for Co 2532, which are set specifically for the two codes, and starts looking for AAIs for Co1. For some reason, it looks up to the BU in the header. The non-recoverable tax codes are fine. We also get