Hey,
Model_Page Model contains this : http://scrp.at/aeg
Model_Report is related to Model_Page one-to-one, Where Model_Report has a few extra fields like 'assigned_id'. When building the form using this method
http://fuelphp.com/dev-docs/packages/orm/observers/included.html#os_validation
It checks the validation rules of only the Model_Page, not Model_Report. Fieldset::instance() only takes 1 Model, and doesn't check the related Models for validation ?