Description: Index of the corresponding referenced class - only valid if the agentDiffServClassRuleMatchEntryType is set to refclass(10). The set of match conditions defined for the reference class are directly inherited by the current class.

Restrictions: 1) The class types of both, current class and the reference class must be identical (i.e., any vs. any, or all vs. all). 2) Self-referencing of class-name is not allowed. 3) Any attempt to delete the reference class while still referenced by any class shall fail. 4) The combined match criteria of classname and reference class name must be an allowed combination based on the class type. Any subsequent changes to the reference class name match criteria must maintain this validity, or the change attempt shall fail.