Comment by ydlr

It seems to me that the whole concept of an off-the-shelf ERP is misguided. These systems have to be heavily customized to fit the needs of the any particular organization. Why not just hire a couple programmers, build what you need from the ground up, using open source components where appropriate? It might take longer than 18 months to finish, but it sounds like that wasn't a realistic estimate for configuring an ERP, either.