Trouble with (unwanted) field validation

Hi,

given the following model field:

room_setup = models.ForeignKey("roomsetup", verbose_name='Default room setup', blank=True, null=True, default='')

In the modelform __init__ method I'm setting the choices for this field like this:

        self.fields['room_setup'].choices = roomsetups_as_choices(subevt)

def roomsetups_as_choices(subevt):
    rs = [['', '-----']]
    for setup in roomsetup.objects.filter(Q(subevent__isnull=True) | Q(subevent=subevt)):
        rs.append([setup.id, setup.name])

    return rs

When adding a new record I keep getting the following validation message, but only for the first try to submit of the form:

"Select a valid choice. That choice is not one of the available choices."

It passes without error on the second try... I really don't understand why?

IMHO it should not complain at all...

Any ideas?

Thomas

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