How REPLACE ORDERING Differs From CREATE ORDERING
The following rules and behaviors differentiate the REPLACE ORDERING and CREATE ORDERING
If you specify REPLACE ORDERING, and the specified ordering exists, the system replaces
it with the new definition.
If the specified ordering does not exist and the associated UDT does not have a defined
ordering, then the system creates the specified ordering.
If the REPLACE ORDERING statement specifies an ordering for a UDT with which an existing
ordering is associated, the system returns an error to the requestor because you can
specify only one ordering per UDT.