http://codereview.appspot.com/186196/diff/1/12 File tryton/gui/window/view_form/view/list_gtk/parser.py (right): http://codereview.appspot.com/186196/diff/1/12#newcode827 tryton/gui/window/view_form/view/list_gtk/parser.py:827: state_changes = PYSONDecoder().decode(model.expr_eval( missing import: from tryton.pyson import PYSONDecoder