The KnowledgeExchangeHandler is the parent class to both the BPMExchangeHandler and RulesExchangeHandler. In it, work is done to choose which action (and thus, which mappings) should be executed based on the Exchange Contracts's operation name. How this operation name is determined is, currently, to first look for the consumer operation, and if not found, then the producer operation. This is backwards. The result is that no registered actions are (sometimes, depending on the contract) found, and the components default action (with no mappings) is taken.