Find out what about your company structure is giving them concerns. Is it your business type? Do you not have enough insurance? Are they asking to look at your financials? Its not uncommon, in big partnership cases that hinge on the balance sheet, to have an angel provide a short-term investment to shore everything up (although ideally that will happen before you share the data with your prospective partner) - I know that I've done that before.

If people at the other company really want the deal to happen, it will happen. If you're unsure to exactly what the blocker is, your best bet is probably to ask whoever your internal advocate is directly. Without that information you're likely to spend a lot of effort in solving the wrong problem.