This attribute adds a constraint to a joining condition.
Astrogator <Satellite Object Path> SetValue <Attribute Path>.JoiningConditions.{Joining Condition}.Constraints {Value}
The value is a constraint that is employed as a further condition that must be met in order for the joining condition to be considered satisfied.
Astrogator */Satellite/Satellite1 SetValue MainSequence.SegmentList.Follow.JoiningConditions.Duration.Constraints UserDefined
STK Programming Interface 11.0.1