Netflow Version 9 error message and NAT support

I have recently upgraded my free version of NFA to 5.5 and then enabled Netflow Version 9 on my router. I am now getting a message every so often in NFA:

V9 flows of unknown template are received from [x.x.x.x]

Are there any additional changes I need to make to the router?

I also read that Netflow 9 has support for NAT (amongst other things such as MPLS). I have an issue with the netflow stats on a NAT interface (ADSL Dialer) whereby the egress stats are shown on the Dialer interface and the ingress stats are shown on the Virtual-Access interface that is bound to it. I was hoping Netflow 9 would somehow get around this issue and show the ingress and egress stats on the Dialer interface only - it hasn't so far but I may have missed something on the configuration.

Andy