Does Iraq's (OCV) voter registration sexually discriminate?

Below are FAQs from the Iraq Out-of-Country voting web site. Is this contrary to the TAL or is there a reasonable explanation why Iraqi nationality can be proved through a father but NOT a mother?

"24. How can I register to vote?

.....In order prove eligibility, you must present at least two acceptable documents which confirm all of the following:

I. Identity can be proven by a document issued by a state, state agency or international institution, which contains a recognizable photograph. This may include, for example: Iraqi or foreign passport or ID Card, Driver’s License, government-issued refugee identification (refugee ID Card or official travel document).
II. Birth on or before 31 December 1986; and
III. Iraqi nationality: In order to prove Iraqi nationality, you must present a document or documents issued by state, state agency, international institution or International Red Cross organization which confirm that you were born in Iraq; or you have current or had previous Iraqi citizenship; or your father has Iraqi nationality." ..

"25. What documents prove that I have Iraqi nationality?

You will need to show documents that confirm one of the following:

I. You were born in Iraq: You must present a document which lists place of birth as in Iraq.
OR
II. You have current or you had previous citizenship of Iraq: You must present a document which lists citizenship or nationality.
OR
III. Birth to father of Iraqi nationality: You must present a document or documents which show paternal link plus your father’s nationality as Iraqi. Your father’s registration receipt may be accepted as proof of father’s nationality." .....

http://www.iraqocv.org/php/faq.php?lang=eng#4

Article 20(B) of the TAL, according to the above site, "forms the basis for all Iraqi law during the transition period." - "(B) No Iraqi may be discriminated against for the purposes of voting in elections on the basis of gender, religion, sect, race, belief, ethnic origin, language, wealth or literacy."

http://www.iraqocv.org/php/downloads/UNPAN015883.pdf