Smarts 8.1.2.3 - Cisco ASAs displaying 0 percent of CPU utilization

Apparently Smarts is not collecting correctly the CPU utilization of Cisco ASAs

CPU utilization collected direct on equipment:

# show cpu

CPU utilization for 5 seconds = 2%; 1 minute: 3%; 5 minutes: 3%

Collected via SNMP:

# snmpwalk -v2c -c xxx xxx.xxx.xxx.xxx 1.3.6.1.4.1.9.9.109.1.1.1.1

SNMPv2-SMI::enterprises.9.9.109.1.1.1.1.2.1 = INTEGER: 1

SNMPv2-SMI::enterprises.9.9.109.1.1.1.1.3.1 = Gauge32: 4

SNMPv2-SMI::enterprises.9.9.109.1.1.1.1.4.1 = Gauge32: 5

SNMPv2-SMI::enterprises.9.9.109.1.1.1.1.5.1 = Gauge32: 5

Collected via Smarts:

# /opt/InCharge/SAM/smarts/bin/dmctl -s XXXXX get Processor::PSR-xxx-xxx-asa/1::CurrentUtilization

0

Model configuration:

.1.3.6.1.4.1.9.1.670 {

    TYPE = Firewall

    VENDOR = Cisco

    MODEL =  ASA 5520

    CERTIFICATION = CERTIFIED

    CONT = Cisco-Router

    HEALTH = Cisco-Entity

    NEIGHBOR = Cisco-Cdp

INSTRUMENTATION:

    CPU/Memory                          = CiscoRouter:DeviceID

    Interface-Fault                     = MIB2

    Interface-Performance               = MIB2

    Interface-Ethernet-Performance      = CiscoRouter_Ethernet

}

How can I collect the correctly CPU utilization on Smarts?

Thanks, Rudolfo.