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When you drag and drop SaveStream operator from Output category (on the palette), IEP editor creates /IEP/External/SaveStream in the text view. The same is true for other 3 operators mentioned here. I think that it should be /IEP/Output/SaveStream instead. The gui view, and text view of IEP editor are kind of inconsistent. This is not a show stopper, but the fix of the problem may cause migration issues. That is, the existing event processors that use SaveStream operator will not show on IEP design canvas after the fix.