Message Oracle ORA-36712 - (XSMXALLOC02) Relation workspace object must be a one-dimensional self-relation to be used as a SOURCE or BASIS with ALLOCATE.

ERROR	(XSMXALLOC02) Relation workspace object must be a one-dimensional self-relation to be used as a SOURCE or BASIS with ALLOCATE.
CAUSE	The user specified an invalid source or basis relation on the ALLOCATE command line.
ACTION	Modify the relation to be a one-dimensional self-relation.