As ahofle hinted, that has nothing to do with the rom. Mame doesn't (yet?) emulate it 100%, and wants to let the user know it's not close to perfect, so don't expect it to be, so don't complain when it doesn't work perfectly.
If you're using the official MameUI, it has the warnings included.
BTW, any reason you're using the UI version if you have a real frontend?