not getting print out of PO

Dear all,

I am not getting print out of PO. In the message out put, the config ( NACE , MN04 ) and as well as all setting are correct. in FURTHER DATA tab, the despatch option id 4 : Send immediately ( when saving the application) ; but it is not generating any spool request for print out. i have checked in SP01 and SP02 , but I could not find out any spool request. More interesting, with the existing config and message setting , we were getting print out till one day ago but presently it is not working.

Hoping for corrective solution.

Regards,

Partha