Message Oracle ORA-36637 - (XSDUNION05) The concat dimension cannot be defined as UNIQUE because it has a non-unique concat base dimension workspace object.

ERROR	(XSDUNION05) The concat dimension cannot be defined as UNIQUE because it has a non-unique concat base dimension workspace object.
CAUSE	A non-unique concat dimension cannot be used as a base of a dependent unique concat.
ACTION	CHGDFN any non-unique concat base dimensions to UNIQUE and retry.