You need to assign PortChannel0/0 to the virtual sensor for your IPS to inspect traffic, just looked at a 5512 we manage and confirmed it.
If you launch the IDM and go to Configuration\Policies you can click on vs0, select Edit, and you should see the interface options available to assign to the virtual sensor and you should only see PortChannel0/0 there to assign.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
[toc:faq]Introduction:This document describes details on how NAT-T
works.Background:ESP encrypts all critical information, encapsulating
the entire inner TCP/UDP datagram within an ESP header. ESP is an IP
protocol in the same sense that TCP and UDP are I...