Urgent--How to record the checks issued outside oracle in R12 with old dates and pe-printer check nu

Hi Payable Experts,

             We have a very very urgent requirement. We are trying to record checks issued outside in oracle through Payment process manager in R12. The requirement is we want to process  checks issued around 1 week back with check numbers.(not autogenerated).What setup need to be done.

       I am able to do this through manual checks but users want to use payment batch since there are lot of checks and it will be regular process. Please help me asap.

Thanks

kris