Module Pool Program

Dear experts,

                     While executing the following query in modulepool initial screen.

SELECT  *

         FROM resb

         INTO CORRESPONDING FIELDS OF TABLE git_paint

         WHERE baugr = gv_matnr

         AND matnr = g_matnr

         AND sortf = g_sortf.

I have problem.If i pass the values to baugr and matnr, the internal table is filling.

But if i pass the value only in baugr, it is not fetching.please explain me clearly.

Regards

Samir