Oracle : Ошибка ORA-12713

"Character data loss in NCHAR/CHAR conversion"
*Cause: When character set conversion happens between CHAR and NCHAR
either implicitly or explicitly, some characters are lost
due to no mapping characters in the destination character set.
*Action: Make sure all the characters can be mapped to destination
character set or set NLS_NCHAR_CONV_EXCP to be FALSE.

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