ORA-63361
Cannot drop the hidden column of timehouse enabled table
Cause
An attempt is being made to drop the hidden column of a timehouse enabled table.
Action
Retry specifying a user-defined column of a timehouse enabled table. The following are the hidden columns in a timehouse table: SYS_STARTIME, SYS_ENDTIME, SYS_STARTSCN, SYS_ENDSCN, SYS_OPERATION and SYS_XID.