BDC session method

Hi friends,

This may be one of the silliest question but i just couldn't get a solution .

Is it possible for me to have fields like material, plant etc in selection screen for a bdc session mehtod. As per the posts, i need to define a selection screen containig the file name and based on the file and its data the bdc program for sesion will work but is there any way to define material,plant etc as well coz my requirement is to check if the material and the plant exist and if so then go ahead and create the bdc session.

Please help.

Thanks,

Prem