UML22 — Section: 12.3.37

It's a common modeling scenario that an object flow with an outpin pin at the source must target an action directly (without a pin). For example a decision node with an incoming object flow - the object is necessary for the guard condition -, but one or more of the target actions don't need that object. Due to the constraint that object flows don't have actions at either end I must model an input pin. For example in case of a CallOperationAction an operation with an additional parameter must be defined even if I don't use it. It's just for modeling purposes. I've assumed before reading the constraint in the specification that an object flow can target an action directly. In that case it's semantic is the same as for the control flow. That works perfect for me. I would propose to weaken the constraint for object flows that actions as targets are allowed. The object token enables the action and gets lost. Any other solution with the same semantic is also acceptable.

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