When an entity used as a reference in a feature is missing, a ghost of the missing reference appears in the graphics area, and a warning message appears in the PropertyManager. Ghosting is supported for parts and assemblies.
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The ghost appears in the same location with the same size, shape, and type as the original reference. For example, a planar face is represented by a planar ghost.
To set the ghosting color, click . Under Color scheme settings, click Selected Item Missing Reference.
For more information, see Displaying a Ghost Image of a Missing Sketch Entity.