Manufacturing MRP. Every other manufacturing company has their own way of doing things and none of the MRP solutions on the market are flexible enough to work for these companies.
Yes, that's the one. I'm not going to go through all of the players, but take a look at Katana MRP. They have a very rigid way of defining what an order is, what a product is, etc. Very specifically, they only allow one layer of subassembly, whereas at least two manufacturers I know have at least 2 levels of subassemblies. They expect their users to adhere to their process, not the other way around.
Nothing that I'm aware of, no. The reason this is on my radar is I'm working part time for a manufacturing company for which the existing MRP solutions don't work.
Do you mind if I bend your ear about what your needs are? If so, send me an email. It's in my profile.