Just upgraded to 1.7.0.2 (rom 1.7.0.0 ?) and am getting compile rrors when I recompile Bus Object

I ran the upgrade, rebuilt the Bus Objects and then compiled Bus Obj App....which is giving errors

I went into a Business Object, made a few changes (set up a few additional required fields) rebuilt the Business Object, and recompiled the project. This seems to have cleared the warning messages. Just wondering if I normally have to do this after an update.... perhaps modifying a business object has the effect of initializing something ??