Oracle : Ошибка ORA-12704

"character set mismatch"
*Cause: One of the following:
- The string operands(other than an nlsparams argument) to an
operator or built-in function do not have the same character
- An nlsparams operand is not in the database character set.
- String data with character set other than the database character
set is passed to a built-in function not expecting it.
- The second argument to CHR() or CSCONVERT() is not CHAR_CS or
- A string expression in the VALUES clause of an INSERT statement,
or the SET clause of an UPDATE statement, does not have the
same character set as the column into which the value would
be inserted.
- A value provided in a DEFAULT clause when creating a table does
not have the same character set as declared for the column.
- An argument to a PL/SQL function does not conform to the
character set requirements of the corresponding parameter.

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