Problem

-- getting such error in Message Log, at the Send Activity level (Integrator to Interchange)

GI TransportReport: Event = 'MessageRejected' RejectReason = 'An error occurred while trying to build a binary collaboration: Could not continue building a binary collaboration because the business protocol was not determined.'

Resolution

* the output tab of the Service used for the processing of the message does not reference a valid exchange point

* open the related Service, click on the outut tab and set a correct exchange point (typically : "Deliver to "application")