After partial receiving user cancelled one line in PO, what action to be taken?

There is 2 lines in a PO, in that 1-line user received 2 qty and cancelled another 2 qty. know they don't want to invoice that line and want to return since the 2 qty line amount showing in total. if we leave as it is will there be any impact, will it allow to finally close the PO

It is a service (expense line) in this case what action to be taken for that 2 qty. Please advise.