selection screen error

hi all,

I have a selection screen 9001 . In that if i give the value for parameter matnr and execute it will show details of ernam,mtart,matkl in table control in module pool screen 9002. Now if click back button in 9002 it will go to screen 9001.And if i click BACK button in 9001 it should go to program, but it goes again to the screen 9002. so what should i do for going back to program after clicking BACK in 9001 screen??i have also tried with set pf-status and kept a function key for BACK and wrote when 'BACK'.

leave program.

in AT selection of 9001 screen..

please help.

regards,

Siva.