(form "00613" (size 65 12)
  (heading "DEFINE THE GEOLOGY ZONES")
  (label (position  4 9) (text "Intercept from"))
  (label (position 32 9) (text "Intercept to"))
  (scroll_block "optional_tables" (position  4  4) (size 56  4)
     (extra  0  1)
     (scroll_size 56 10)
     (repeat interactive (grow  0  1) (instances  1 (min  1) (max 10)))
    (main)
    (top
      (label (position  1  0) (text "TABLE"))
      (label (position  13 0) (text "FIELD"))
      (label (position  25 0) (text "SPECIFICATION")))
    (main
      (field "table_name" (position  1  0) (display_length 9) (input allowed)
      (translate none) (null allowed) (max_length 18)
      )
      (field "field_name" (position  13  0) (display_length 9) (input allowed)
        (null allowed) (max_length 18)
        )
      (field "specification" (position  25  0) (display_length 29) 
        (input allowed)
        (translate none) (null allowed) (max_length 255)
        )
    )
  )
  (field "int_from" (position 18 9) (display_length 8) (input allowed)
    (max_length 8) (null disallowed)
    )
  (field "int_to" (position 45 9) (display_length 8) (input allowed)
    (max_length 15) (null disallowed)
    )
  (default_buttons)
)