[HAPI-devel] Problem with MDM_T02 Message

[Davide A. <dav...@if...>]

Hi to all
I'm newbie and i have a probelm with parse message MTM_T02, my message 
it's compose of this segment :
MSH
PID
PV1
TXA
OBX
OBX
OBX
I have tersed the message with this:
Terser tIn = new Terser(in);
and all work fine,
when i get some field of MSH, EVN, PID, PV1, TXA i don't have any 
problem and i use a code like this :
String Field = tIn.get("/EVN-2")
When i try to obtain e 1 field of OBX segment : String Field = 
tIn.get("/OBC-5-5") i have this error:
ca.uhn.hl7v2.HL7Exception: Can't find MDM_T02 as a direct child
In particular i have the necessity to take the 5.5 field of obx segment 
for refert.
Probably i make an'error in a code , how to get this field from my message?
Many Thanks to all.