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In ArcGIS 9.1 and earlier, the following warning occurs if a relationship class is added into ArcMap using the Add Data button.
"Could not add the specified data object to the map."
ArcMap does not support loading a relationship class as a data layer.
This warning does not indicate 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.