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To gather the Tx and Rx flows to your remote site you will need to burn a license for both you ethernet and serial interfaces. Netflow only works on the ingress direction of the interface(with exception of using "true" MPLS and egress ip flows). So in order to see full data stream you need to have it applied to both interfaces.
I would open a quick TAC case on this.
I was able to set up ingress and egress flow on my devices (at least with new code).
38xx w/ 12.4.xx
on my interface
ip flow ingress
ip flow egress
Larry is right - on some code levels you can set it up on the ingress and egress. Depends on the IOS version...