31731 Cannot modify message attributes
Cause
This error occurs if you attempt to change the value of the property of a JadeGenericMessage instance after calling the beginMessage or putMessage method of the JadeGenericQueue class.
In the following example, an attempt is made to set the replyQueueFullName property of a JadeGenericMessage instance after calling the beginMessage method. (The property should be set before calling the beginMessage method.)
myQueue.beginMessage(msg, "Timeout=10000");
msg.replyQueueFullName := myQueue.fullName;
Action
Correct your code.
