select statement is going for dump.

hi experts ,

I've created a FM with import parameters as plant and storage location.

i've to retrieve the following data into a internal table itab. using table mcha and mchb.

this the code

Select matnr , charg, vfdat from MCHA table

          where MCHA-MATNR = itab -MATNR

          AND mcha-lvorm = ‘ ’

         AND WERKS = iv_werks

Select matnr , charg, vfdat from MCHA table

          where MCHA-MATNR = itab-MATNR

          AND mchA-lvorm = ‘ ’

         AND lgort = iv_lgort.

can u pls tell me wher ei'm going wrong.