formbuilder and relation table with properties

(oups sorry for my previous post in a existent thread, I repost it : ) Hello all, Here is my problem : I've two table : "Type" and "Year" (annee in French) and a many to many relation between then with properties(so I've a third table called "Date"). I want that a person could add a relation between a certain year and a selection of type and edit the relation properties. So I used formbuilder to generate a form for the table Date, I ask it to show the primary key and I make the function prepareLinkedDataObject to select types and the date I want. But formbuilder make an update : (I've activated the debugLevel) UPDATE date SET [... properties of the relation ...] WHERE date.id_annee = 2006 AND date.id_type = 2 And there is no record with this "where condition" precisely because I want it to create. I guess it's because I set hidePrimaryKey to false. I also tested with the Year object and use crossLinks and crossLinkExtraFields but it seems that extra field are of the linked table and not of the relation table. So how I can do this ??? Thanks for answers. I apologize for my English. Florent