Meaning: The width of the branch trench run is large enough to cut one of the trench part's geometry in the header trench run.
Recovery:
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Select the header trench run whose trench feature is in error.
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Modify the Sketch 3D path in the Graphic View so that the width of the branch trench run is less than the sketch segment of the trench feature.
-OR-
Decrease the Inside Left Width or Inside Right Width value in the Properties View so that the width of the branch trench run is less than the segment length of the header trench feature.