OCI-14767
Cannot specify this interval with existing high bounds
Cause
The interval specified conflicts with the existing high bound for the last partition. The combination might lead to invalid dates for high bounds in the future.
Action
If this is a CREATE TABLE, try specifying a different high bound value for the last partition, or a different interval. If this is an ALTER TABLE SET INTERVAL, please choose either a different interval, or, modify the table to change the high bound for the last partition.