IBM Queue Manager over writing the value of User Identifier in MQMD

We are trying to write a message to IBM MQ using JMS, we are able to write the message but notice that the field UserIdentifier in MQMD is getting over-written by the QManager.

We've tried both these properties to set user id,

message.setStringProperty(JmsConstants.JMS_IBM_MQMD_USERIDENTIFIER, "ourUserID");
message.setStringProperty("JMSXUserID", "ourUserID");

We also have these properties before setting the User id,

message.setBooleanProperty(WMQConstants.WMQ_MQMD_WRITE_ENABLED,true);
message.setIntProperty(WMQConstants.WMQ_MQMD_MESSAGE_CONTEXT,WMQConstants.WMQ_MDCTX_SET_ALL_CONTEXT);

also the Queue Manager and Queue have the required configuration,

+setall +setid +passall

but still we are unable to get required result. What can we do different over here ?

This is an extract from one of my programs:

MQQueue d = (MQQueue)destination;
String altusr="myuserid";
d.setMQMDWriteEnabled(true);
outMsg.setBooleanProperty(MQConstants.WMQ_MQMD_WRITE_ENABLED, true);
outMsg.setStringProperty(CommonConstants.JMS_IBM_MQMD_USERIDENTIFIER, altusr);
d.setIntProperty(MQConstants.WMQ_MQMD_MESSAGE_CONTEXT, MQConstants.WMQ_MDCTX_SET_IDENTITY_CONTEXT);

It's possible that this only works if you are using the JMSContext API model rather than the older createSession() approach as that can also affect when the underlying MQOPEN or MQPUT1 happens. Which in turn affects whether the context-setting flags are referred to.