stor2rrd 2.41 free and trap send

Hi expert

I set up alerting to receive email and trap when some limits are over

The mail arrives correct

So I can see in the subject:

STOR2RRD alert: DS8870_iOSA:IOSAo_8708: VOLUME: metric:response time, actual value: 50.73 ms (Limit 50)

and in the email text

STOR2RRD alert
 Time: 15:45:01 14/01/2019
 Storage: DS8870_iOSA
 VOLUME: IOSAo_8708
 Metric: response time
 Average response time during last 10mins: 50.73 ms
 Limit: 50

In this way I can see the storage Name and the volume Name

In the received snmp trap I see

Mon Jan 14 15:47:57 2019 .1.3.6.1.4.1.40540.2.0.1.0.7.0.7 Normal "Status Events" sgsvrasrrd001lx.sistemi.group - XoruX application STOR2RRD SNMP agent is providing message data. DS8870_iOSA VOLUME resp_t 50.73

I loose the Volume Name

in the snmptt.con I set up (from your xorus file)

EVENT stor2rrdSendTrap .1.3.6.1.4.1.40540.2.0.1.0.7.0.7 "Status Events" Normal
FORMAT XoruX application STOR2RRD SNMP agent is providing message data. $*
EXEC /home/nag-script/Storage/checkErrori-trapd-DS8xx.sh $R $*
SDESC
XoruX application STOR2RRD SNMP agent is providing message data.
Variables:
  1: stor2rrdStorageName
  2: stor2rrdType
  3: stor2rrdItem
  4: stor2rrdValue
EDESC

Why I Can't see the volume name ?

thanks and Regards

Emilio