As you know, the Element Catalog lists available elements preceded by an annotation symbol that indicates whether a particular type of element is valid at the current location. The annotations are:
Heavy checkmark: the element is permitted at the current location
Light checkmark: the element is permitted, but something else must precede it
Checkmark combined with a plus sign: the element is permitted and defined as an inclusion
Question mark: the element is permitted but other changes must be made as well
No annotation: the element is not permitted
The Smart Catalogs for inserting, wrapping, or changing an element display the available elements usually preceded by one of the same annotations. In FM 2015, however, no annotation appears before an element permitted as an inclusion. The lack of an annotation suggests the element is not permitted.
I have not tested this situation in previous versions of FM.