Identifies the Condition for this data restriction.
Foreign key to Condition.
Usually this is null. When this is non-null, then the data
being accessed (usually the main Mbo in the set) must satisfy
the condition in order for the privilege to be granted in that
situation. When ConditionNum is null, the privilege does not
depend on data.
GroupName
The group authorized for this option.
Foreign key to MaxGroup.
OptionName
The option name.
App and OptionName compose the foreign key to
SigOption.
Save the object and other linked objects.
Subclasses can code their save() logic to include any appropriate updates
to other linked objects and call super.save().