Regarding Start routine and field routine

Hi ,

Please correct me if I am wrong .

1 below code will check the material details from it_material with the source mat_plant ,if it is not euqal then it will delete the all data in the source_package .

2 if we are doing declaration in the global part of the start routine then will it available across endroutine and field level routine .

READ TABLE it_material  INTO wa_material

         WITH KEY material = <source_fields>-mat_plant

         BINARY SEARCH.

       IF sy-subrc <> 0.

         DELETE SOURCE_PACKAGE.