Preprinted Check - External Assignment

Hi

Can any one help me for the below..

I am assigning External Assignement ( Preprinted check numbers on the check form) in check management.

But when i do the payment run through FPY1. system is not generating preprinted check numbers.

My requirement is we are giving check number renge in FICO ( for when we the Automatic Payment Run through F110) Same number i have to use in FPY1 when i do the payment run in FICA.

Many thanks in advance, It would be very helpful for me to proceed further...

Sriram. A