Oracle® Database 11g / 12c / 18c error codes EXP-00086: Primary key REFs in table "[string]"may not be valid on import

EXP-00086: Primary key REFs in table "[string]"may not be valid on import

Oracle Error Code: EXP-00086

Cause: The specified table contains primary key REFs which may not be valid in the import database.

Action: Do not use Export/Import to move Primary key REFs between databases having differing character sets.