diff --git a/addons/project_timesheet/project_timesheet.py b/addons/project_timesheet/project_timesheet.py
index 00a28ce2b50..141b5756271 100644
--- a/addons/project_timesheet/project_timesheet.py
+++ b/addons/project_timesheet/project_timesheet.py
@@ -28,16 +28,7 @@ from tools.translate import _
 
 class project_project(osv.osv):
     _inherit = 'project.project'
-    def onchange_partner_id(self, cr, uid, ids, part=False, context=None):
-        result = super(project_project, self).onchange_partner_id(cr, uid, ids, part, context=context)
-        if result.get('value', False):
-            try:
-                d = self.pool.get('ir.model.data').get_object_reference(cr, uid, 'hr_timesheet_invoice', 'timesheet_invoice_factor1')
-                if d:
-                    result['value']['to_invoice'] = d[1]
-            except ValueError, e:
-                pass
-        return result
+    
 project_project()
 
 class project_work(osv.osv):