We did try out a few invoices by putting sales tax on the PO header line. I'm not an accountant or 'purchaser' so I can just relay what they tell me.
It's been very frustrating because one would think that Infor could have told us 'okay, you need to do this and this with the tax, make sure this and that form are populated, and when you run MA540 this is what should happen.' It's not like we're experimenting with some new unusual idea but we get the feeling we're trying to re-invent the wheel. We've had two tickets open with them and they seem unable to guide us in getting this working so I'm appreciative of whatever input I can get from others.