Parts vendors are only looking out for their own profits, don't be had.
As a business owner I have worked with many different management systems to find one that works for me. I went from provider to provider and failed time after time. Every road block in my business lead to another expense with an additional company because the providers did not have an all in one solution for my niche market. They were all just trying to capitalize on their product without adding benefit or value for my company. This trend is similar to the main issues that I have run into with repair facility owners as well.
As an Automotive/ Truck Repair facility, you have demands from your clients, weather it is a private owner or a fleet company. Your customers want service that is timely, efficient, and done right the first time. They don't care what time and effort you put into providing the perfect service, they simply want it right and the want it now! Unfortunately some software and repair information providers limit you only to what they are capable of, and that limitation limits your businesses ability to provide your client with outstanding service. You live in a day and age that information is at everyone's fingertips. Why not let it all be at your as well.
Haven't you noticed that parts vendors sometimes cant even get their parts correct. How can you trust them with your business lifeline. Yes, your management system is your businesses lifeline.