(form "20070" (size 34  9)
  (help "20070_TIP_0")
  (heading "SPECIFY VALUE TO ASSIGN")
 (label (position  4  3) (text "Value"))
  (label (position  4  5) (text "Constrain interpolation"))
  (field "value" (position  10  3) (display_length 16) (input allowed)
    (null allowed) (max_length 64))
  (field "constrain" (position 26  5) (display_length  1) (input allowed)
    (value_in "Y" "N") (default "Y")
    (translate upper) (null allowed) (max_length 1))
  (default_buttons)
)