Dear Jairo,

I don't know Spanish so let me explain it in English :). Hope translator will help you.

Element => An element is a keyword which is used to define a business object node.The element name must be unique within the node. The element type can be a simple data type, for example, ID, or it can be a structured data type such as Amount.

Composition Association => A navigational relationship from a superordinate to a subordinate node and vice versa: Composition associations point from the parent to a child node and from the child to the parent node. They are automatically part of the business object model when a node is created.

Intra-Business–Object Association => Internal association (also referred to as intra-BO association) enables navigation between nodes that is not provided directly by structural relationships.

Cross-Business-Object Association => Composition that allows multiple instances of the target node Cross-business-object associations link nodes of separate business objects.

Note - Intra and cross-business-object associations can only have the [1,1] multiplicity.

Dependent-Object Association => A dependent business object association is a reusable part in another business object. It represents a concept that cannot stand alone from a business point of view.

Intra-Business-Object Association that allows multiple instances of the target node => Intra-business-object associations link nodes within one business object.

Cross-Business-Object Association that allows multiple instances of the target node => Cross-business-object associations link nodes of separate business objects.

Regards

Anant