Problem with JpaContainer , Filters.joinFilter and Event

Flow
1

This is my code:


private CachingLocalEntityProvider<Anagrafica> entityProviderAnag = new CachingLocalEntityProvider<Anagrafica>( Anagrafica.class, Anagrafica.entityManager() );
private JPAContainer<Anagrafica> anagCont = new JPAContainer(Anagrafica.class);
...
cbAzienda = new ComboBox();
anagCont.setEntityProvider(entityProviderAnag);
						
			cbAzienda.setContainerDataSource(anagCont); 
			cbAzienda.setItemCaptionPropertyId("ragsoc");
			cbAzienda.setItemCaptionMode(ComboBox.ITEM_CAPTION_MODE_PROPERTY);
			cbAzienda.setFilteringMode(Filtering.FILTERINGMODE_CONTAINS);
			cbAzienda.setImmediate(true);
			cbAzienda.setNullSelectionAllowed( false );
			
			cbAzienda.addListener( 	
				new Property.ValueChangeListener() {
					public void valueChange(ValueChangeEvent event) {
						getWindow().showNotification(  event.getProperty() );	
				    }
				}
			);

This works perfectly and valueChange Event is sent.

But if I add …

anagCont.addFilter( Filters.joinFilter("periodiAB", Filters.or(filters) ) );

My combo is filled with the correct list, but if click on any item


Any events aren’t sent.

Why?

Thanks