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This error occurs when adding a new feature to a feature class in a personal geodatabase in ArcMap:
Create: An unexpexted failure occured
General function failure (_FeatureClass)
Syntax error in query expression '(OBJECTID IN (6) ) AND (_FeatureClass.OBJECTID NOT IN (SELECT OBJECTID FROM DELTA _FeatureClass ) )'.
The feature class has a leading underscore (_) in its name. This causes queries used for inserting new features to fail.
Rename your feature class so it doesn't have an underscore as the leading character.