Question related to use of WorkEffortAssoc entity in OFBiz.

Hello All,

We have *WorkEffort* Entity in OFBiz in which we maintain a recursive
relation ship using attribute *parentWorkEffortId.*
Here we again have the *WorkEffortAssoc *in which we again relate two
workeffort by using the *workEffortFrom *and* workEffortTo.*
Now my question is like that, if we have a relationship to relate the
workEffortId by it self ( i.e by an another workEffortId ), then why we need
the
*WorkEffortAssoc *for the same purpose.

*Or it is for handeling a different scenario in (OFBiz Work Effort Data
Modeling).
**
*
*Thanks and Regards
[Rishi Solanki]*