Order Release Leg Constraint Ship With Group is not working in multi-leg planning

Summary:

I am using Leg constraints which are available at Order Release constraint level.

Here is my requirement:
1. Leg Classification ID = FIRST and SHIP WITH GROUP = ROUTE1
2. Leg Classification ID = FINAL and SHIP WITH GROUP = ROUTE2

I have used same Leg Classification ID's in the multi-leg itinerary.
-Primary Leg has Leg Classification ID as "FIRST" and
-secondary Leg has Leg Classification ID as "FINAL"

I have 4 orders and I have defined Leg Classification Constraints at Order Level like Below:

*For ORDER1, ORDER 2, ORDER 3:
1. Leg Classification ID = FIRST and SHIP WITH GROUP = ROUTE1
2.Leg Classification ID = FINAL and SHIP WITH GROUP = ROUTE2