[MERGE] [FIX] pos: prevent two users opening the same session

lp bug: https://launchpad.net/bugs/1098226 fixed

bzr revid: mat@openerp.com-20130620154608-7u8pci09muxedvje

addons/point_of_sale/wizard/pos_session_opening.py

@@ -87,6 +87,7 @@ class pos_session_opening(osv.osv_memory):
         session_ids = proxy.search(cr, uid, [
             ('state', '!=', 'closed'),
             ('config_id', '=', config_id),
+            ('user_id', '=', uid),
         ], context=context)
         if session_ids:
             session = proxy.browse(cr, uid, session_ids[0], context=context)