Associations

An association is a direct and unidirectional relationship between two nodes. An association can also behave reflexively connecting a business object node with itself.

You can use an association to navigate from a source node to a related target node. You can define associated nodes in one or more business objects or business object enhancements. If you define associated nodes in more than one business object, you define cross-business-object associations. You can also use associations to create new node instances of subnodes.

You define the CUSTOMER_INVOICE business object with more than one association. You connect the ROOT node to the ITEM node with an association that has 1:N cardinality.