Section 9-521 - Uniform Form of Written Financing Statement; Amendment; and Cooperative Addendum(a) Initial financing statement form. A filing office that accepts written records may not refuse to accept a written initial financing statement in the form promulgated by the department of state except for a reason as set forth in Section 9-516 (b).(b) Amendment form. A filing office that accepts written records may not refuse to accept a written financing statement amendment in the form promulgated by the department of state except for a reason as set forth in Section 9-516 (b).(c) Cooperative addendum form. A filing office that accepts written records may not refuse to accept a written cooperative addendum in the form promulgated by the department of state except for a reason as set forth in Section 9-516 (b).