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Steps : 1. Create a java-platform UML project 2. Create a class diagram and add two enumeration elements 3. Using contextual menu item, expand the attribute, opration compartments of both the enu elements 4. To one of the enumeration elements, add a few attributes. get/set method generated automatically. 5. Save all. 6. on diagram editor, drag/drop Atts & Ops from one Enum to another OR from Int/Class to Enum 7. Exapnd the attribute compartments, you will see the dropped attribute 8. Drag n drop the next attribute. You will observe that the old attribute disapper (from the target)
Attributes may disappear on the first attempt. Actually, while they disappear from diagram elements, they are still visible in uml project tree.
the root cause is the same as that of 78371
verified in nb55 entpack beta m17.