We don't use DU, but we use LP thru Freddie. It's my understanding that LP does not approve or deny the loan, it only tells you if the loan is elgible for sale to Freddie and the degree of documetation you have to provide based on the acceptance level. I'm not sure if DU works the same way or not.
We make the final decision and report the loans on our LAR, and when we sell them to Freddie I assume they report them as purchased loans.
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The opinions expressed are mine and they are not to be taken as legal advice.