Hi all, i'm having a problem getting an InvariantsValidator working on a grouped form using z3c.form. Imagine the following setup: class GroupOne(Group): fields = Fields(IMyForm).select('second_attribute', 'third_attribute') class GroupTwo(Group): fields = Fields(IMyForm).select('fourth_attribute', 'fifth_attribute') class MyForm(GroupForm, Form): fields = Fields(IMyForm).select('first_attribute') groups = (GroupOne, GroupTwo) Now, the z3c.form.validator.Data object passed to my InvariantsValidator only contains the 'first_attribute'. I think this is caused by line 190 in field.py: def validate(self, data): fields = self.form.fields.values() Why is this method only looking for form.fields and not aggregating form.fields and possible form.groups? Is it an unsupported use case, or am i just not getting it? Thanks, Oliver