GR-IR clearing Posting issue

Question

Hi,
The scenario step is
1. PO creation
2. Service entry creation and acceptance
3. Invoice verification
The issue is, after the invoice is posted, when i look at the accounting doc, the posting should be from GRIR to Vendor. but instead the accounting doc contains GR/IR as well as the GL postingv(the GL which is maintained in PO).
Why the posting is happening against GL account of PO? (Note : GR/IR clearing flag is checked in Invoice).
Can someone help pls?
Regards,
Maniraj

Answer 1

Thanks everyone for your responses. It has been a great help. I found one more peculiar behaviour,
I post a partial invoice, PO value - 500
Now, WBS avail budget - 1000, commitment is 500 Actual - 0
GR Value  - 250,
WBS avail budget - 1000 commitment becomes 250, Actuals 250
IR value - 150 (partial invoice) with GRIR cleared
WBS avail budget - 1100, Commitment 250, Actuals 150 I understand it is STD.
Now i post a subsequent invoice, for 100 for the same PO with GRIR indicator unchecked in MIRO
but WBS avail budget - 1100, Commitment 250, Actuals 150.
There is no change in WBS actuals or avail budget
Instead when i post a subsequent invoice, for 100 for the same PO with GRIR indicator checked in MIRO
WBS avail budget - 1000, Commitment 250, Actuals 250
There is change in WBS actuals and budget gets reduced accordingly.
Sorry for making it long, just want to explain the scenario clearly..
Can someone please explain why there is no change in WBS actuals in previous case?
Thanks