Sorry to say ERP Project goals are many times only given the ”we must have some” treatment meaning they are not considered as important as they actually are for the success of an ERP project. So how do you know they are any good?
An ERP project influences how work will get done in the company post go-live. So, to design a project organization you need first to look at your line organization to identify all roles needed. Then do the same with your IT organization.