purchase department creates big purchase orders with lots of lines.

While purchasing the products, the buyer cannot know from where the products will be shipped.

e.g. the buyer orders from a vendor that is departed in the netherlands (EU) and also in USA (third country).

Cause the invoice is linked to a purchase order, the tax exempt number in the invoice header can't be changed.

It is possible to change the tax exempt number in the invoice line, but the lookup appears in the left side up corner and the lookup is frozen - no tax exempt number can be chosen. Browser window must be refreshed to get the lookup disappear.

As this behaviour also occurs e.g. in intrastat scenarios MS should fix problems like this soon.

workaround: copy and paste tax exempt number in the invoice line field.