New Spool Request for each purchase order

Hi all,

Whenever i create Purchase Order, spool is generated. But when i create one more purcahse Order new spool is not getting generated.

It is goind inside the same pool.

I want the spool number, so i can generate the pdf for the PO form and send it through mail through workflow.

Kindly adivce me how to generate new spool evertime when new PO is created.

Regards,

Rahul.