Fix online order system - php/mysql

I am using an online invoice and inventory system called NOLA. You can download and play with it here: [login to view URL] There is an online demo available here: [login to view URL] We have a bug where if you make an invoice(1), and then make another invoice(2), when you go back to try to modify or add to invoice(1) it BLANKS out the order instead of updating. You will have terminal services or ftp access, I need you to find and fix this bug. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform Windows, IIS, MYSQL, PHP