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Error: A selected item could not be added to the map

Error Message

While attempting to drag and drop a relationship class from ArcCatalog into ArcMap, the following warning is returned:

"A selected item could not be added to the map."

Cause

ArcMap does not support loading a relationship class as a data layer.

Solution or Workaround

This warning does not indicate that there is a problem with the relationship class. The functionality of a relationship class is always available when objects participating in that relationship class are loaded into ArcMap.

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