(form "00264" (size 51  6) (mismatch ignore)
  (help "00264_TIP_0")
  (heading "FILE ALREADY EXISTS APPEND OR REPLACE")
  (label (position  2  3) (text "File"))
  (label (position  2  4) (text "(A)ppend or (R)eplace"))
  (field "obsfile" (position  7  3) (display_length 40) (input disallowed))
  (field "apprep" (position 25  4) (display_length  1) (input allowed)
    (value_in "A" "R")
    (translate upper) (null allowed) (max_length 1))
  (default_buttons)
)