IPSLA operation Status message: Operation not found on the node. Cisco CRS Router with IOS-XR software.

I have a case open regarding an issue I'm seeing on Cisco CRS routers running IOS-XR.

I have successfully created IPSLA operations on a Cisco CRS router (Cisco CRS-4/S, IOS Version 4.3.2) but SolarWinds is not successfully collecting stats from the router. The status message being received is: Operation not found on the node. This is despite the fact that I used SolarWinds to scan for & add the IPSLA operations I had created on the router. The wizard completes but the IPSLA status is seen as down. I can also confirm that the IPSLA operations are active & returning data on the router.

Has anyone else experienced this issue?