PO closing Procedure ?

Hello!!

We are on BPCS 6.1.01, Mixed Mode (plateform AS400)

We are facing problem in closing partially received
POs. For example, PO# 1 has quantity ordered 100, we
received 75, due to some reason we have entered
invoice for 70 units only, Now we want to close this
PO. Please note that we are not using tolerance % to
auto close POs. 
sometimes while closing PO, we receive message, PO
already selected for close or in use. But neither
status field in HPH/HPO shows close status nor PHBUSY
has "y" flag. 

Can someone guide us what is the right procedure of
closing Open POs, and what fields are updated when po
is closed, and finally, what happens to closed POs
when we run month end program. 

Thanks

Roy





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