problems with tui forms (.per) with interval field defined like database field

I am unable to input interval values in a form when the form field is 
defined like a database column with interval type.
If I change the definition in the form to "interval day to minute" it 
works, but if I use "like testtable.interval_field" in the form 
definition I get "error in field" whatever I input (at runtime). The 
form itself compiles just fine in bot cases.

Given a database called 'test' with this table:
create table testtable (interval_field interval day to hour);


and the attached form and 4gl program, this can be easlily reproduced

Is this a known bug? Are there workarounds (other than changing the form 
field definitions)?
-- 

*Øyvind Gjerstad *
Systemkonsulent

M +47 909 41 485
[email protected] <mailto:[email protected]>

*____________________ _*


*PostNord AS *
T +47 09300
IT og Forretningsutvikling
Øran Vest
Postboks 100
6301 Åndalsnes
www.postnord.no <http://www.postnord.no>

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database test
main
define p_tst interval day to minute,
       p_dummy char(1),
       p_minutes interval minute(3) to minute

  open form f_test from "foo"
  display form f_test

  while true
    input p_tst
      from formonly.tst
    let p_minutes = p_tst
    display p_minutes to formonly.resultat

    input p_dummy from formonly.dummy
    if p_dummy = "q" then
      exit while
    end if
  end while

end main

database test
screen
{
----------------------------- test av interval input --------------------------



                     Oppgi et intervall: [f000          ]


                     Du har oppgitt:       [f001          ]



                     [c]
}
END


TABLES 
testtable

ATTRIBUTES
f000=formonly.tst type like testtable.interval_field, required;
f001=FORMONLY.resultat TYPE char(10), noentry;
c=formonly.dummy type char(1);

INSTRUCTIONS
DELIMITERS "[]"

END