Ariz. Admin. Code § R10-3-203
A. Each charge shall contain the following:
B. Not withstanding the provisions of subsection (A) of this rule or R10-3-202, a charge is deemed filed when the Division receives from the Charging Party a written statement sufficiently precise to identify the parties and to describe generally the unlawful action or practice or if received from the Commission. A charge may be amended
2. To clarify and amplify allegations.
The amendments alleging acts occurring before the filing of the charge which constitute unlawful employment practices directly related to or growing out of the subject matter of the original charge shall be deemed to relate back to the original filing date.
Adopted effective September 2, 1977 (Supp. 77-5).