Oracle Message ORA-14204 - subpartition bound of subpartition number string is too high

ERRORsubpartition bound of subpartition number string is too high
CAUSEHigh bound of the specified subpartition displayed in this message did not collate lower than that of the subsequent subpartition.
ACTIONEnsure that high bound of every subpartition (except for the last one) collates lower than that of a subsequent subpartition.