Payment journal of PO

Hi All

i have invoiced the Purchase Order,then for the payment i went to Payment journal but in that form i havnt found anything the form is blank.Can anyone tell me the procedure how to take the payment against po.If any setup required please tell me i am not getting even from the manual.After invoicing what to do to take payment.please

thanks

You have to generate a payment proposal - is it actually due? I suggest you read the finance manual on AP for a step by step guide and all of the setup elements