FWA detect not existing VPN traffic

FWA detect not existing VPN traffic

Hello,
we have cisco asa 5510 (8.02) with AIP SSM and through VPN site-to-site traffic (ISA VPN Tunnels). Traffic reports (FWA) show not existing traffic for ip address of remote VPN peers (ISA VPN site-to-site members) every day (by 4000 mb for some ip address (rem. VPN peers)). How to cancel this not existing traffic ?

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