Problem with Tax in PO-matched Invoices

 Hi,

my manual AP invoices are working fine.

But when I match a PO (for the same supplier etc.) with an AP invoice, my standard tax rate is picked and the rule I expected is not picked..

I do not think that this has to do something with my tax setup / rules, because in Tax Simulator the right tax is applied with the rule + condition set I expected.

Any ideas what could be my problem?

Maybe some informations I can enter in the Simulator are not brought to AP via Purchasing?

We are on 12.1.3.

Best Regards,

Katharina