Hi Ritesh,
As said by Ameya Karadkhedkar, if you are going to pass the values using selection screen, then pass those screen fields instead of ls_material.
Parameters: p_matnr type matnr,
p_extwg type extwg,
p_mstae type mstae,
p_mtpos type mtpos_mara.
Replace: ls_material-matnr -> p_matnr
ls_material-extwg -> p_extwg
ls_material-mstae -> p_mstae
ls_material-mtpos_mara -> p_mtpos
Thanks & Regards,
Prasanna