Shows whether an object is added to a pour unit, and how it was added.
Use with the following content types:
CAST_UNIT(only precast, not cast-in-place cast units)
The possible values are:
0: The object is not added to any pour unit, or has been modified after the pour units were calculated the last time.
1: The object was manually added to the pour unit using the Add to pour unit command.
2: The object was automatically added to the pour unit using the Calculate pour units command.