fix insert button

app/activities/TransactionEditor.py

@@ -54,7 +54,7 @@ class TransactionEditor(FocusWidget):
             self.clear()
             self.focus_on(self.edit_fields['product'])
         elif key == 'insert':
-            self.save_and_clear_cb()
+            self.save_and_clear_callback()
         elif key == 'ctrl p':
             self.focus_on(self.edit_fields['product'])
         else: