Netflow: problem with loopbacks - need help

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Problem: I'm using policy routing to send traffic from all in. interfaces to different loopbacks to deal with NATed traffic. Connectivity is OK, but netflow is not working right: in show ip cache flow all flows that go through loopbacks are shown with "dest int = null" and not exported. No matter where export is enabled (f0/0 or logical interfaces).

What could cause that?

I have this problem too.
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