nhibernate - fluent nhibarnate doesn't delete orpahns -

i found similar threads got code answer.

i using one-to-many relationship.

father mapping:

  hasmany(x => x.targetings).keycolumn("fk_campaign_id").cascade.alldeleteorphan().inverse().asbag(); 

and child :

 references(x => x.nhcampaign).column("fk_campaign_id"); 

where father has list of child. working - inserting , updating. reason when empty list in father or want delete list item, doesn't delete child database. if list empty.

this how update:

 using (isession session = nhibernatehelper.opensession())             {                 using (itransaction transaction = session.begintransaction())                 {                     session.update(fatherobject);                     //session.saveorupdate(ocampaign);                     transaction.commit();                 }             } 

am doing wrong here?

got using not.lazyload() method.