Enter a maintenance request, assign a vendor, attach a fake invoice.

Then find someone to come in and verify - I think for one park we used a well driller to come out and check out the system.Then there's the rest of the due diligence - checking financials, bank statements, reviewing invoices, etc, and making sure they P&Ls they've provided line up with expectations.Also with MHPs, keep in mind that it's the lot rent portion that is capped, and not the rental income portion above the lot rents.Good luck with it allWe contracted with @Steve Edel to oversee due diligence for some acquisitions - he might have a more suggestions

Are all my invoices uploaded to my owner portal?

If not, they take care of it and send you the invoice.

TenantCloud.com offers the ability to add/review repair logs, add photos, and include proposals, invoices, and payments. 

I still get some vendors that mail me paper invoices or have our accountant/bookkeeper scan in documents however at this time I outsource my bookkeeping and I'm guessing they despise scanning as much as I do as they normally do not do it and I have to micromanage it to make sure bills get paid timely. 

Are you getting a break out of labor and material with vendor original invoice?

Easy Invoice (such a life savor) 4.)

So if you create an invoice for a property that is being paid to a services provider the owner doesn't see it until it is paid and shows up in their report.

Called the tenant and told him if he was going to lie at least pre date the check.The next month I send the tenant an invoice for the rent, late fee, plus $250.