28 CFR 5.207: Incorporation by reference.
(a) Each initial, supplemental, and final statement shall be complete in and of itself. Incorporation of information by reference to statements previously filed is not permissible.
(b) Whenever insufficient space is provided for response to any item in a form, reference shall be made in such space to a full insert page or pages on which the item number and inquiry shall be restated and a complete answer given. Inserts and riders of less than full page size should not be used.