Will User Defined Functions ever be allowed for use as part of a Check Constraint (eg. the sql code below)? Or, am I just doing it wrong?

Consider that the columns label_type_id and label_category_id are part of the table being updated/inserted.

ALTER TABLE mf_product_label ADD CONSTRAINT mf_product_label_CK3 CHECK (labelTypeCategoryId(label_type_id) = label_category_id);

Thanks in advance.