Hi ,
In standard there is no such a report available. You can search these values from following way
MB5S for (GR/IR balances) Balances
You can take GR value and IR value from EKBE table , pass transaction event key "1", the entry related to GR and pass transaction event key "2 ", the entry related to IR for particularly Po .
or
In MB5S, you can take IR and GR value but you should select cleared item if you want to know what are Po's cleared, if you want to balances (still pending) don't select cleared items.
PO amount will get from ME2N or you can take from EKPO table.
Number of Po's you can take from ME2M or you can use EKPO table.
Why i am giving these table details, it is helpful if you want develop the new report.