Steve
That attribute is used for fields related to the Autogen feature, which is only allowed in batch actions executed outside package processing.
The endevor dialog happens to use the same panel to capture action parameters regardless of how the action is going to be processed (foreground, batch or package).
In order to save panel interactions with the user, we use these ISPF variables to set the field attributes so that autogen can be requested only when the action is going to run in non-package batch mode.
Hope this helps
Eduard Penafiel
CA Endevor support