LINK BETWEEN BUSINESS AREA AND MATERIAL NUMBER

Hello EXPERTS,

I have a report based on a custom table .The custom table contains company code, materials and their date run as primary keys.

In the selection screen I am having one field business area, based upon the value entered in the selection screen in business area field I have to retrieve the corresponding materials.

I want to know the relation between business area and materials ( resp. tables and primary keys)

Plz any one guide me on this ...

SRI