PURCHASE ORDER REVISION NOT GETTING CHANGED FROM 0 TO 1

PURCHASE ORDER REVISION NOT GETTING CHANGED FROM 0 TO 1

We are facing an issue.

1) Created a PO & approved it.

2) Created PO matched invoice also for the above PO. Note that the invoice amount is a partial amount of the PO.

3) Fetched the same PO again, reduced the quantity in PO. Submitted it & approved it again.

4) But, the PO revision is not getting changed from 0 to 1.

5) Still it is showing as 0.

6) Is there any setup for this?

Thanks.