I got some incomprehensible statements one time from a joint venture. I paid an accountant to do my taxes since I couldn't figure out. There answer to me was "I have no idea what this is trying to say, so I'll just submit it. If you get audited let me know and we'll work it out"
If you have a joint venture then your situation probably is complex enough that an accountant is something need anyway. At that point have them do the taxes as well. Most people don't have that complex a situation.
