Oracle : Ошибка ORA-36691

"(NTEXTCNV02) Invalid escape sequence in argument to UNISTR function: %i."
*Cause: The user called the UNISTR function on a string that had an
invalid escape sequence. The only valid escape sequences in UNISTR are
1.) an escape-escape sequence, and 2.) an escape, followed by exactly
four hexadecimal digits.
*Action: Make sure that all escape sequences in UNISTR arguments are
exactly four hexadecimal digits. To represent codepoints whose value
is less than 0x1000, use preceding zeros. WRONG: 0x10; RIGHT: 0x0010.

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