Netflow export Cisco ASR9K to Netflow Analyzer

Netflow export Cisco ASR9K to Netflow Analyzer

I've configured netflow on our Cisco ASR9001 to export flows to Netflow Analyzer. However i'm not seeing:

1. any IN  traffic in Netflow Analyzer. Only seeing OUT traffic
2. The OUT traffic shown in Netflow Analyzer is just a fraction of the actual traffic on the interface

I've kept the sampling rate on the Netflow Analyzer interfaces to the default of 1.

Is there some specfic configuration rquired on the ASR9K's to work with Netflow Analyzer and also what is the recommeded sampling rate ?