uhm, I tested your on trunk, and also switched some things because I don't 
have db.raw_material and db.run_as_rm, but

def add_composition():
    form = SQLFORM.factory(
        Field('dog_id', requires = IS_EMPTY_OR(IS_IN_SET(['a','b','c']))),
        Field('cat_id', requires = IS_EMPTY_OR(IS_IN_SET(['a','b','c']))),
        Field('number', 'double', requires = IS_NOT_EMPTY()),
        Field('comment', 'text'),
        Field('date', 'date'), 
        onvalidation = validate_survey)
    if form.process(onvalidation = validate_survey).accepted:
        response.flash = 'success'
        redirect(URL('index'))
    return dict(form=form)

works for me (i.e. error is shown if dog_id AND cat_id are selected, and if 
there is no selection at all).
PS: works the IS_IN_DB version AND the IS_IN_SET version

On Friday, July 13, 2012 4:31:09 PM UTC+2, joe wrote:
>
> Just a note, this seems to fail in other situations as well
>
> My code:
>
> def add_composition():
>     form = SQLFORM.factory(
>         Field('dog_id', requires = IS_EMPTY_OR(IS_IN_DB(db, 
> db.raw_material))),
>         Field('cat_id', requires = IS_EMPTY_OR(IS_IN_DB(db, 
> db.run_as_rm))),
>         Field('number', 'double', requires = IS_NOT_EMPTY()),
>         Field('comment', 'text'),
>         Field('date', 'date'), 
>         onvalidation = validate_survey)
>     if form.process(onvalidation = validate_survey).accepted:
>         response.flash = 'success'
>         redirect(URL('index'))
>     return dict(form=form)
>
> def validate_survey(form):
>     if form.vars.dog_id != None and form.vars.cat_id != None:  #someone 
> can't have a dog and a cat
>         form.errors.dog_id = "Only one of these"
>         form.errors.cat_id = "Only one of these"
>     elif form.vars.dog_id==None and form.vars.cat_id==None: #but they need 
> a pet (this is a simplified example)
>             form.errors.dog_id = "You need a material"
>             form.errors.cat_id = "you need a material"
>
> The validation somehow works if they are both empty, but not if they are 
> both populated.  (I have tested 'if form.vars.dog_id and form.vars.cat_id:' 
> and that fails as well
>

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