E Biz Tax -- GST behaviour on Purchasing.

Hi All

Seeking input / answers if we implement GST  at the PO level.

If we apply GST at PO level.

1) If PO is for partial receiving, behaviour of input tax if GST is implemented @ PO level.  we currently do have tax @ PO.

2) If Invoice vs PO has discrepancy due to GST value  (invoice more than PO value), the re-approval will fall back to PR level or PO level.

3) If there's rounding issue at the vendor's quotation, is the system allow us to make the changes to GST as per vendor quote?

4) If we have a blanket agreement, eg 4 line item (by qtr), how would the system cater for GST calculation?