I do not know how to copy and paste out of an adobe file, but if you look at lasors, section F10, it says that it is a prerequisite condition for adding an initial multi pilot aircraft rating to you licence. So yes it seems like it is mandatory to be able to get an MPA IR. But I have heard of some operators who like you to do their own MCC, so look into who you want to apply for and then work out where to do it.