Subroutine Pool Program

i am doing the SAP Script for US Check, i am copying the standard program RFFOUS_C to Z program and standard form F110_PRENUM_CHCK to Z form. To populate new data into the form , i am creating a subroutine pool program and i am writing the logic inside that, but i am not getting the output.

Actually i want to print the following:

check date --- &PAYR-ZALDT&

amount --- &PAYR-RWBTR&

payee name --- 7PAYR-ZNME1&

in their specigic postions.

Secondly, the following fields i want to print the following fields in a BOX.

vendor number -

&REGUH-LIFNR&

vendor name -

&REGUH-NAME1&

document -

&REGUH-VBLNR&

check date --- &PAYR-ZALDT&

check no -

&PAYR-CHECT&