(form "50120" (size 51 14)
  (heading "QUALITY PARAMETERS")

   (scroll_block "qualities" (position  4  4) (size 61  7)
     (extra  0  1)
     (scroll_size  155 7)
     (repeat interactive (grow  0  1) (instances  1 (min  1) (max  6)))
    (top)
    (main
      (field "name" (position  5  6) 
        (display_length  8) (input allowed)
        (null disallowed) (max_length 8))
      (field "dfield" (position 15  6) 
        (display_length 32) (input allowed)
        (null disallowed) (max_length 32))
      (field "quantity" (position 15  6) 
        (display_length 32) (input allowed)
        (null disallowed) (max_length 32))
     )
  )
)