DU Day 1 Certainty Begins. On Dec.10 components of Fannie Mae’s Day 1 Certainty initiative become effective. Day 1, announced in October, gives customers freedom from representation and warranties on key aspects of the mortgage origination process through Fannie’s Desktop Underwriter platform. Asset and employment validation as well as Collateral Underwriter freedom from reps and warrants for appraisals begins Dec. 10. Fannie Prices Latest CAS CRT Deal. Last week, Fannie Mae priced its latest credit risk sharing transaction under its Connecticut Avenue Securities program. CAS Series 2016-C07, a $701.7 million note offering, was scheduled to settle on Dec. 8, 2016.