The certificate of acknowledgment (PDF) must be in the form set forth in California Civil Code section 1189. Can I back out of it if I receive a better offer from another company?Send the letter directly to the office, department or individuals involved in the situation. Simply sending the letter to the ombudsman is not appropriate. Offer letters aren't considered legal documents because these documents just propose a position to potential candidates. The medium has no effect on its legality. Apply to as many UC campuses as you like with one application. Note: If you intend to study in Quebec, the Quebec Acceptance Certificate (CAQ) serves as the Provincial Attestation Letter. You cannot accept a receipt showing the employee has applied for an initial grant of employment authorization.