DIA-25267
Did not specify the signature for a receiver non-repudiable queue.
Cause
The signature was not specified for a receiver non-repudiable queue. Oracle Advanced Queuing (AQ) maintains the entire history of information about a message along with the message itself. This information serves as proof of sending and receiving of messages, and does not allow the receiver to dispute (repudiate) this.
Action
Try dequeue again along with the signature.