Do all three layers need to be recompiled? Is that correct?

[Profound Logic]

Question:
When a field is added to an existing program...all three layers (gui, handler, rpg) all need to be recompiled? Is that correct?

Answer:
When a field is added, you are adding a DDS field to a display file. The display file will need to be recompiled at that point. Once that is done, the RPG program will also need to be recompiled or you will get a level-check error. The handler itself never changes – it is not generated or compiled.