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CASA today does not act differently depending on (or show) what the message exchange pattern is for an invocation, whether it is in-only (one way) or in-out (request reply) for example. For bindings the defaults generated or wizards guiding should only generate the appropriate parts, no output for in- only interfaces for example. It also needs to display this visually in CASA as it is important to visualize and know what needs to be configured.
Connections in CASA today are at the porttype level, not at the operation level. It doesn't make too much sense to differentiate one-way from request-reply today.