Kitty:

Without seeing your exact PO setup my guess is this happened becasue you are posting taxes when the receipt is posted, not when the invoice is posted.

In Steve's part of the world they only have sales tax which is only charge on items purchased for internal consumption. So for most USA based PO users they are not concerned about tax and if they were it would go to the same debit account as the goods purchased, whereas here in Canada we can recover the tax so it goes to a different account.

At this point you may want to work with your Adagio consultant to review the setup and changes that could be made.