net-snmp user to receive getone

Hi All,

My environment is Linux Suse 10 and i configured net-snmp-5.3.0.1. I succed
to send trap in snmpv3 to hpux system and all others.
My problem is the follow:
On hpux system i installed the SNMP Security Pack to send and receive a
snmpv3 traps. So when i try to run the "getone" command from hpux to my
Linux node, the followin error shows me :

getone: REPORT received, cannot recover:
                              at line 785 in file util_v3.c
usmStatsUnknownUserNames.0 = 1

the getone command works right if i try to use it with v1 or v2c.
Where i wrong?
I suppose this is an error about some users but i don't understend what and
how i can configure it.

Thanks in advance,
Vinc.