Thank you Steve,
As per your suggestion if i made required changes, while network traffic returning back (which was initiated through core --> srx340 -->srx240--> towards MPLS network) what will be complete path...
From MPLS network --> srx240 --> srx340 --> core switch or MPLS network --> srx240 --> core switch
Please remember SRX240(Packet mode) already have return traffic route for internal network traffic through core switch.
Thank you..