Hello Nikhilesh
Many times it happens that the rules are working through BRF+ but they don't work through NWBC.
Try -
1. Deactivate BRF+ rule and rule set and try again
2. Activate the rule again
3. Check naming conventions
4. Debug the program and find out whether it is triggering properly or not
And -
Go through the SCN link below -
http://scn.sap.com/thread/3344567
Kiran