Unable to send some documents via Oxalis-Ng-Outbound

[Alby5521]

When I try to send a document using Oxalis-Ng-Outbound only in some cases will this error be returned to me:

Failed to transmit document: You are not allowed to override the EndpointAddress from SMP.

I call the library that and pass this data to it:

TransmissionRequest request = requestBuilder
                    .sender(sender)
                    .receiver(receiver)
                    .documentType(documentType)
                    .processType(processIdentifier)
                    .payLoad(documentStream)
                    .build();

            logger.debug("TransmissionRequest built successfully");

            TransmissionResponse response = transmitter.transmit(request);

I also tried to send myself the exact same document using the Oxalis-Ng-Standalone tool and the document is sent without any problem.

Why does this mistake only happen to me in some cases and not always?

[OysteinLq]

Any chance you're reusing your requestbuilder instance? I think that could trigger this problem -- I think it would in practice work on the first attempt at sending a document, and from then on only work for documents that go to the same endpoint.
Never seen this issue ourselves, so couldn't say for sure.