The answer to this was posted on another forum where CAP1 posted this question, so I thought I'd share the answer with all of you as seeing it didn't make sense to me either until this guy, who owns a mortgage company explained it.
This is called "sourcing and seasoning funds" and it is absolutely required, no exceptions these days. They may demand the past 2 months full bank account statements, documentation that you own the company, and the written / signed terms of the loan you have extended including the payment and term. They may also require a corporate resolution showing that you have corporate authority to extend the loan or documentation that you are the sole shareholder in the company.
A year ago none of this would have been required. But today.... its a disaster. Lenders underwriting, particularly in declining markets like Florida, are digging deep for any reason they can come up with to deny a loan. In fact, I would not be surprised at all if they use the fact that he needs to borrow funds in order to close as a reason for denial. Expect to have whatever documentation you submit to them highly scrutinized and they will probably come back asking for more and there is a good chance what they ask for will be impossible to provide. They will know this before they request it... the impossibility will be exactly why they request what they do.