A nice feature of BizTalk 2004 is the possibility to have many-to-one maps. This means that a single map requires multiple input messages and produces a single output message. This type of mapping is often required to support complex message flows. When you create a map, you see a wizard-like screen in which you have to specify input and outputs message types, as well as the map name. Based on that, BizTalk generates an empty map for you. In case you have specified multiple input message types, BizTalk ......