Plant in BOM-ABAP

Hi,

I am giving material in my screen(Table control) and i am using "CS_BOM_EXPL_MAT_V2"

function module to display BOM's.

In this function module i have to give PLANT..then only it will display BOM's..

But in my screen i am not getting polant from user...I am getting only the materials.

How to get the Plant for that material.

Help required in this regard...Also let me know how to check whether BOM exists for this material (suggestion for Coding required...not thru CS03 Tcode)