wan rtt monitor source interface

wan rtt monitor source interface

Hi
In my network I use vrf.
I would like to configure wan rtt in one particular vrf on my cisco router
I configure it using source ip address (and destination) in that vrf 
Next I add "vrf vrf_name" command on my router
I test it using show ip sla statistics and it works fine
But OPManager don't monitor it. 
It is strange thing. When I go to path detail it shows me address of my loopback instead of address of subinterface in vrf that I configured previously.  
I am using OPManager version 8810

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