OneToMany association with optional collection
How to do this?

I have Article class with unidirectional association to Zone via link table:
@OneToMany(fetch = FetchType.LAZY)
@JoinTable(name = "LNARTICLEZONE", joinColumns = { @JoinColumn(name = "ARTICLEOID") }, inverseJoinColumns = { @JoinColumn(name = "ZONEOID") })
public Set<Zone> getZones()

Zone does not know about Article.

What I want is to insert article in database without zones. Since in some use cases it is not needed.
With above mappings I get two inserts (as expected):
insert into article.. which is good :)
and insert into lnarticlezone which I would like to avoid since it should be optional!

Any ideas?