UndergroundSpan_Duct

There is no design representation of UndergroundSpan or Duct, therefore, only one version of this relationship is needed:

UndergroundSpan_Duct, the As-Built Relationship

Relationship Class Property	Value or Choice
Name	UndergroundSpan_Duct
Origin Table or Feature Class	UndergroundSpan
Destination Table or Feature Class	Duct
Relationship Type	Simple
Forward Label	Duct IMPORTANT: The Forward Label you type while creating the relationship must match the EsriBuiltName entry in the schema.xml file for this component.
Backward Label	UndergroundSpan
Message Direction	None (no messages propagated)
Cardinality	1–M (one to many)
Relationship Attributes	No, I do not want to add attributes to this relationship class.
Primary Key	NetworkId
Foreign Key	UndergroundSpanId