PR To PO conversion via ME59, Closed Indicator

Hi,

We have set up ME59 to create POs from PR.

1.The 'Closed' indicator (in Quantities/Dates tab of PR) was not set. What to be done?

2. Main thing which is baffling is that in Production system, multiple POs continue to get created for a single PR.

Any thoughts on how to have the indicator set up to closed in PR?

and How to avoid the multiple PO issue?

fyi..

while running ME59, I have set 'Set Requisitions to "Closed"' to '1'.

Regards