OCI-05794
The length of column "string" used for row versioning of a blockchain or immutable table cannot exceed string bytes.
Cause
An attempt was made to create a row version in a blockchain or immutable table on a column whose length exceeds the maximum allowable for row version columns of the given data type. For VARCHAR2 and CHAR columns with character length semantics, the length compared with the maximum is not the declared length in characters but the implicitly calculated length in bytes, as shown in the DATA_LENGTH column of the ALL_TAB_COLS view.
Action
Decrease the column length and retry the operation.