Here we are. Please note that I added just one logical-system on SNMP
//--SNMP--//
federico@fw1.r2.thw> show configuration | match snmp | display set
set snmp name fw1.r2.thw
set snmp description "xxxxxxxxxxxl"
set snmp location "xxxxxxxxxx"
set snmp contact "xxxxxx"
set snmp interface fxp0.0
set snmp filter-duplicates
set snmp engine-id use-default-ip-address
set snmp client-list list0 xxxxxxxxxxx
set snmp client-list list0 xxxxxxxxxxx
set snmp client-list list0 xxxxxxxxxxx
set snmp community yocomm authorization read-only
set snmp community yocomm client-list-name list0
set snmp community yocomm logical-system ls-application routing-instance default
set snmp trap-options source-address 10.32.123.10
set snmp routing-instance-access
set snmp health-monitor
set policy-options prefix-list snmp-servers xxxxxxxxxxx
set policy-options prefix-list snmp-servers xxxxxxxxxxx
set policy-options prefix-list snmp-servers xxxxxxxxxxx
set firewall family inet filter protect-re term allow-snmp from source-prefix-list snmp-servers
set firewall family inet filter protect-re term allow-snmp from protocol udp
set firewall family inet filter protect-re term allow-snmp from destination-port snmp
set firewall family inet filter protect-re term allow-snmp then accept
//--LSYS--//
set system login class ls-application-admin logical-system ls-application
set system login class ls-application-admin permissions all
set system login user lsapplicationadmin class ls-application-admin
set system security-profile ls-application-profile policy reserved 60
set system security-profile ls-application-profile zone reserved 17
set system security-profile ls-application-profile flow-session reserved 2100
set system security-profile ls-application-profile cpu reserved 25
set system security-profile ls-application-profile logical-system ls-application
[..other not relevant configuration..]