EXP-00086: Primary key REFs in table "string "may not be valid on import
What triggered the Error:
The specified table contains primary key REFs which may not be valid in the import database.What should we do to fix it:
Do not use Export/Import to move Primary key REFs between databases having differing character sets.
If this was not sufficient go over to:
Oracle Official Support Knowledge Center
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Or maybe those geeks at: StackOverflow Board