Budget return during PR/PO close

HI sapient

CASE (SERVICE PROCUREMENT PROCESS)

PR created - 20 quantity value @ 10 = 200 (Budget consumed in PR Rs 200)

PO created - 10 quantity value @10 = 100 (Differential budget return {200-100=100))

Service entry sheet has been created for 8 quantity and invoice booked for 8 quantity @ 10 = Rs 80

User closed the PO (delivery completion) with remaining quantity of 2

PR is also closed subsequently

ISSUE

After closing the PR and PO with remaining quantity 2 system didnt return back the budget of balance quantity of 2 @ 10 = 20

Please look in to the issue

Thanks & regards

Sasanka