We need to migrate our client's applications from PB6.5 to PB9. I need to give an estimate for that. All the applications are PFC based, and there exists a corporate layer too. I did pilot migration and got errors in PFC pbls like transport object is invalid etc. While I understand that we need to remove references to the obsolete object types, change the type for some of the objects from structure to nvo, I do not have an idea on howmuch time this overall manual process will take. We have 4 applications with each one having 50 pbls. Can anyone please suggest any steps, documents or papers telling me more about migration process which can guide me.