Sec.  7.22   Formal complaints based on unsatisfied informal complaints.

   A formal complaint filing based on an unsatisfied informal complaint filed
   pursuant to  Sec. 4.16 of this chapter shall be deemed to relate back to the
   filing date of the informal complaint if it is filed within ninety days from
   the date that the Commission notifies the complainant of its disposition of
   the  informal complaint and based on the same operative facts as those
   alleged in the informal complaint.