Direct output to spool

Dear experts,

I am trying to pass parameters calculated from report

ZMYREPORT to RM07DOCS ie standard transaction MB51.

i used

SUBMIT with matnr

with budat

However i coud not obtain the resultset.I am passing

material code along with posting date. ie

matnr and budat.

I am using with matnr = '<Value in current prog>'

with budat = '<Value in current prog>'

I also opened RM07DOCS and checked technical names of selection entries in edit selection box and found same.I looked at code but could not find the exact names assigned in report to matnr and budat

Am i passing values to wrong names of selection objects.

I wil be glad if someone could give me a hint here .