Type of Relation (Components)
The following relation types can exist between the components of
a business object.
one-to-one
A component must have a relation with only one other
component.
zero-to-one
A component can have a relation with only one other
component.
one-to-many
A component must have a relation with one or more other
components.
zero-to-many
A component can have a relation with one or more other
components.