Intersection table representing the resolution of a many to many relationship.

acronym (FNK, M: CHAR VARYING(15))
r_quantity_type_nm (FNK, M: CHAR VARYING(40))

ref_quantity_type.alternative_unit_of_measure
This defines the set of alternative units of measure which can be used for this type of quantity.
acronym: Defines a foreign key to table r_uom.
r_quantity_type_nm: Specifies the type of quantity. Defines a foreign key to table r_quantity_type.