I am in a difficult position. My main customer is using either Catia V4.2.2 or V4.2.4 and isnt going over to V5 till the end of next year! I need to talk to them as well as I can by doing all my work in V5Rell 10 and sending it back. Has anyone had any problems with this? Obviously we can bring V4 data over to V5 but its the other way that concerns me. Please help