help me

Hello!
i'm use Netflow 5 monitor trafic in route cisco 3640 but i can not see sub interface serial use frameRelay. please tell me why? this my config

interface Serial0/2
no ip address
no ip unreachables
encapsulation frame-relay
ip route-cache flow

interface Serial0/2.1 point-to-point
ip unnumbered FastEthernet0/0
no ip mroute-cache
no cdp enable
frame-relay interface-dlci 1000
frame-relay payload-compression packet-by-packet
no ip mroute-cache
frame-relay lmi-type ansi
!
snmp-server community test test
!
ip flow-export source FastEthernet0/0
ip flow-export version 5
ip flow-export destination 192.168.200.30 9000