How to call same form by different performs as below?

Question

Hi,
i want to use a Form get_data by calling Perform get_data twice with two different internal tables as below
perform get_data    tables   it_upload
                            using    tab_name
                            changing it_material. 
it_material has structure as below
types : begin of ty_material,
             serno  type sy-tabix,
             matnr1 type mara-matnr,
             matnr2 type mara-matnr,
             matnr3 type mara-matnr,
            end of ty_material.
perform get_data    tables   it_upload
                            using    tab_name
                            changing it_location.
it_location has structure as below
types : begin of ty_location,
            site1  type mard-werks,
            site2  type mard-werks,
            sloc1  type mard-lgort,
            sloc2  type mard-lgort,
          end of ty_location.
now how to declare Form Get_data
can anyone suggest me how to declare Form Get_data

Answer 1

FORM parameters are normally strongly typed, so if you want to pass different tables in different calls to the same PERFORM, you need to use two internal table parameters in the FORM interface like below
FORM foo  USING /CHANGING itab1 TYPE <table type1>
                          itab2 TYPE <table type2>
ENDFORM
Otherwise you need to use TYPE STANDARD TABLE, in which case you can use a single parameter for both the internal tables but you will also need to FIELD-SYMBOLS, and there should be some indication for you to ASSIGN the field symbol to what internal table type that may come at runtime. This will be a overkill, without much use, when you can achieve what you want by simply using two parameters.