a non-void service action that accepts a single argument of the entity type is rendered as a property if it returns a scalar, or a collection if it returns a list<T>.
To prevent the service action from being contributed, use @NotContributed annotation, which is extended to:
@NotContributed ... not contributed at all
@NotContributed(As.ACTION) .... but is contributed as a property/collection (dependent on return type)
@NoContributed(As.ASSOCIATION) .... but is contributed as an action
Contributed collections are implicitly eagerly rendered.
Contributed properties can be hidden from tables by annotating the service action with @Hidden(where=ALL_TABLES), in the usual fashion.