Hi guys,

suppose i have two objects ( b.Load & b.Purchase ) and each one has its chatter.

when i select an attachment, it is displayed in the chatter of the object b.load.
Then i click on "Validate" and the record is created in b.purchase via self.env['b.purchase'].create(..).

What i need is when i click on this record, the attachment must have already been displayed in its chatter ( the chatter of this record in the second object.

in b.load, i have this :

self.env['bi.charges'].browse(self.env.context.get('active_id')).\
            message_post(body,
                         subject=subject.encode('utf-8'),
                         attachment_ids=[x.id for x in self.piece_justif],)

in b.purchase, i tried this but nothing happens : 

subject = ".."       
body = ".."
self.message_post(subject=subject.encode('utf-8'),
                          body=body.encode('utf-8'),
                          type="notification",
                          attachment_ids=[x.id for x in self.env['b.load'].browse(self.env.context.get('attachment_ids'))],)