There is a big difference between "requesting" and "requiring", I did just a quick search to put this question to rest and found this from the Oklahoma Attorney General in a case decided 2/19/2002. I will include the reference link below. "Â¶8 It is, therefore, the official Opinion of the Attorney General that:
Where a broker enters into a listing agreement with a seller, the broker cannot comply with the seller's request not to present offers which are less than the seller's listing price without violating the provisions of the Transaction and Single-Party Brokers statutes and the Oklahoma Real Estate Commission's administrative rules, which require a broker to present all bona fide offers to the seller. 59 O.S. 2001, Â§Â§ 858-353(4)(a), 858-354(B)(4)(a); OAC 605:10-17-4(10)-(11)."
The following is directly from the OREC...
"605:10-17-4. Prohibited dealings
Within the meaning of subsection 8 of Section 858-312 of the â€œCode,â€ untrustworthy, improper, fraudulent
or dishonest dealing shall include, but not be limited to, the following: (11 ) Failure to submit all bona fide offers to an owner when such offers are received prior to the seller
accepting an offer in writing.
â€œBona fide offerâ€ means an offer in writing."
You can request a GFE, but it's not required to submit an offer, and can not be used as a reason not to present an offer.
As my little disclaimer I'm not an attorney and do not specialize in Real Estate Law, this is information found on the internet from previous cases and directly from the Oklahoma Real Estate Commission.