net-snmp-config --create-snmpv3-user snmpengineID

Solaris 10 -- I created SNMPv3 users with net-snmp-config --create-snmpv3-user command. I am using HP Network Node Manager's SNMPv3 Smart Plugin to serve as the SNMP management server. Some SNMPv3 users were automatically created with the same snmpengineID. This causes NNM's brassagt proxy to timeout on any request from a snmp agent once another agent with an identical snmpengineID establishes communication. HP told me to contact the vendor of these devices for information on how to change the snmpengineID. Does anyone know what would cause the duplicate ID's, or how to change the engineID's

Thanks in advance!