Source Event: For UMQ only, means a ULB receiver deregistered.
The ulbReceiverInfo() method will return an info object containing additional information..

C# |
public const int SRC_EVENT_UMQ_ULB_RECEIVER_DEREGISTRATION_EX

C# |
public const int SRC_EVENT_UMQ_ULB_RECEIVER_DEREGISTRATION_EX