GR/IR automatic Blocking & Unblocking

Question

Hi
I have a couple of questions regarding the GR/IR automatic Blocking and Unblocking,
Question 1
Scenario: Looking for Quantity Variance
Purchase Order:           Qty: 10Kg & Price: $20       [@ unit price $2/ 1kg]
Goods Received:          Qty: 6 Kg 
Invoice Received:         Qty: 10Kg & Price: $20
When I post the invoice, this invoice gets blocked automatically because GR is 6Kg & IR is for 10Kg.
How can I unblock the invoice automatically with MRBR?
I have tried the following to unblock the invoice automatically:
(1) I have posted another GR for 4Kg against the same PO and checked the blocked Invoice it is still blocked and couldn't unblock automatically
(2) After posting GR for 4Kg, posted Invoice against the same PO for 4kg, but this invoice is showing as a separate one
i.e.,      Earlier Invoice is $20.00-   (which is our blocked invoice)
           New Invoice        $ 8.00-    (new invoice for 4Kgs)
Still I could not unblock the (blocked) invoice automatically with MRBR.
Please help me with unblocking the invoice automatically.
Question 2
How can we set the tolerance limit for quantity difference between GR & IR as ZERO.
In other words, Qty in GR = Qty in IR else the invoice should be blocked for payment. How do we set this tolerance?
All the thoughts/ replys / suggestions are appreciated by rewarding points!
Thanks!

Answer 1

1. Materials Management>>Logistics Invoice Verification>>Invoice Block>>Determine Payment Block
2. Materials Management>>Logistics Invoice Verification>>Invoice Block>>Set Tolerance Limits
3. Materials Management>>Logistics Invoice Verification>>Invoice Block>>Item Amount Check
Configure these nodes properly and your problem will be solved
Rgds,
Harmees