[FIX] point_of_sale: set pricelist in create

The pricelist is set by default as the one of the first opened session. It's not
necessary correct (if more than one session) and is not working for rescue
sessions. Always set one.

addons/point_of_sale/point_of_sale.py

@@ -763,6 +763,7 @@ class pos_order(osv.osv):
             # set name based on the sequence specified on the config
             session = self.pool['pos.session'].browse(cr, uid, values['session_id'], context=context)
             values['name'] = session.config_id.sequence_id._next()
+            values.setdefault('session_id', session.config_id.pricelist_id.id)
         else:
             # fallback on any pos.order sequence
             values['name'] = self.pool.get('ir.sequence').next_by_code(cr, uid, 'pos.order', context=context)