ORA-30338: illegal dimension hierachy name

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ORA-30338: illegal dimension hierachy name
Cause: An illegal dimensionhierarchy name was specified in a dimension DDL
statement.
Action: Make sure the namebegins with a letter, contains only letters, digits and
underscore and contains no more than 30 characters. If you qualify the namewith
the owner name, make sure the owner name conforms with the requirements for
an owner name on your system.