Issue in populating dropdowns in Visual Composer

Question

Hello Experts,
I am currently trying to push application development using Visual Composer 7.0. Came across certain issues which we were unable to resolve:
1) We have an RFC which gives 10 return tables. We need to fill the data from these tables into respective drop down fields in a form. Now im unable to bind the table to a drop down directly, so is there a way to do it using some operator etc. because if we try to populate each drop down field seperately as many number of RFC calls are made which slows down my application drastically.
2) Other issue is pertaining to concentric drop downs. I need to create drop down fields in my application which interdependent, for example if i select a country lets say India then in my City drop down only indian cities should appear. The RFC is providing the foriegn key relationship in the output.
Please help as these issues are causing bottleneck in application development.
Best Regards
Gaurang

Answer 1

I did PERFORM write_form USING 'ITEM' ' ' ' ' 'MAIN'.
with following code and its not coming... it is showing only last line of that internal table into sap-scripts o/p
FORM write_form USING p_element
                      p_function
                      p_type
                      p_window.
  CALL FUNCTION 'WRITE_FORM'
      EXPORTING
           element                  = p_element
*            function                 = p_function
*            type                     = p_type
           window                   = p_window
*       IMPORTING
*            PENDING_LINES            =
       EXCEPTIONS
            element                  = 1
            function                 = 2
            type                     = 3
            unopened                 = 4
            unstarted                = 5
            window                   = 6
            bad_pageformat_for_print = 7
            OTHERS                   = 8.
ENDFORM.                               " WRITE_FORM