diff --git a/tryton/gui/window/view_form/view/graph.py b/tryton/gui/window/view_form/view/graph.py
index 310ed59fe9..8e574ef4bb 100644
--- a/tryton/gui/window/view_form/view/graph.py
+++ b/tryton/gui/window/view_form/view/graph.py
@@ -38,7 +38,7 @@ class ViewGraph(ParserView):
 
     def display(self):
         for widget in self.widgets.itervalues():
-            widget.display(self.screen.models)
+            widget.display(self.screen.group)
         return True
 
     def set_cursor(self, new=False, reset_view=True):
diff --git a/tryton/gui/window/view_form/view/graph_gtk/graph.py b/tryton/gui/window/view_form/view/graph_gtk/graph.py
index 3cc47ca79e..ec1fbb4d60 100644
--- a/tryton/gui/window/view_form/view/graph_gtk/graph.py
+++ b/tryton/gui/window/view_form/view/graph_gtk/graph.py
@@ -132,7 +132,7 @@ class Graph(gtk.DrawingArea):
     def action_keyword(self, ids, window):
         if not ids:
             return
-        ctx = self.models.context.copy()
+        ctx = self.group.context.copy()
         if 'active_ids' in ctx:
             del ctx['active_ids']
         if 'active_id' in ctx:
@@ -321,21 +321,21 @@ class Graph(gtk.DrawingArea):
         return self.area.x + self.area.w * 0.05, \
                 self.area.y + self.area.h * 0.05
 
-    def display(self, models):
-        self.updateDatas(models)
+    def display(self, group):
+        self.updateDatas(group)
         self.setColorScheme()
         self.updateXY()
         self.updateGraph()
         self.queue_draw()
 
-    def updateDatas(self, models):
+    def updateDatas(self, group):
         self.datas = {}
         self.labels = {}
         self.ids = {}
-        self.models = models
+        self.group = group
         minx = None
         maxx = None
-        for model in models:
+        for model in group:
             x = model[self.xfield['name']].get(model)
             if not minx:
                 minx = x
diff --git a/tryton/gui/window/view_form/view/graph_gtk/parser.py b/tryton/gui/window/view_form/view/graph_gtk/parser.py
index 527facfd0f..6af17904bf 100644
--- a/tryton/gui/window/view_form/view/graph_gtk/parser.py
+++ b/tryton/gui/window/view_form/view/graph_gtk/parser.py
@@ -131,7 +131,7 @@ class ParserGraph(ParserInterface):
                         continue
                     xfield = common.node_attributes(child)
                     if not xfield.get('string'):
-                        xfield['string'] = fields[xfield['name']]['string']
+                        xfield['string'] = fields[xfield['name']].attrs['string']
                     break
             elif node.localName == 'y':
                 for child in node.childNodes:
@@ -139,7 +139,7 @@ class ParserGraph(ParserInterface):
                         continue
                     yattrs = common.node_attributes(child)
                     if not yattrs.get('string') and yattrs['name'] != '#':
-                        yattrs['string'] = fields[yattrs['name']]['string']
+                        yattrs['string'] = fields[yattrs['name']].attrs['string']
                     yfields.append(yattrs)
 
         widget = GRAPH_TYPE[attrs.get('type', 'vbar')](xfield, yfields, attrs, model)