A NullPointerException is raised when sending ADT^A01^ADT_A01 message to the PEC part of the simulator

The simulator raises a NPE when the following message is sent:

MSH|^˜\&|Mediboard|Mediboard|PAMSimulator|IHE|20120223120824||ADT^A01|1521|D|2.5|||||FRA|UNICODE UTF-8|FR
EVN||20120223120824
PID|1||000118^^^^PI˜323388^^^Mediboard&1.2.250.1.2.3.4&OX^RI||PEC-ADT_OX^Pampatientone^^^m^^L^A||19821010|M|||^^^^^^H|||||||12000087^^^^AN||||||||||||N||VALI|20120223120823
PD1||U||||||||||N
PV1|1|O|^^^^O|R|12000087^^^^RI|^^^^O|43^ABCD^Jean-Mi^^^^^^Mediboard&1.2.250.1.2.3.4&OX^L^^^RI|||||||90||P|43^ABCD^Jean-Mi^^^^^^Mediboard&1.2.250.1.2.3.4&OX^L^^^RI||321155^^^Mediboard&1.2.250.1.2.3.4&OX^RI||CM|N||||||||||||||4||||||||20120223120000
PV2||||||||20120223100000|20120224080000|||||||||||||N