Projects by their nature are very different from business processes and require a different management approach based on a different way of thinking about work. The problem many organizations experience is that the managerial approach used by their project managers is an approach that was born in the machine age. Those skills are inconsistent with the aim of project management. I would submit that this is one of the primary reasons for so many projects failing. Those that have been sucessful are full of heuristic learning not often replicated.
Every project manager needs two things, conceptual knowledge and application knowledge.
I believe from significant experience that the conceptual is very week because it is not resident in many organiztions. I think this kind of profound knowledge must come from the outside if it does not exist within. That can usually best be accomplished through an outside source providing training. Training adds new knowledge, and shapes attitudes which leads to improved behavior which leads to increased commitment as a result of inmproved project management experiences.