slapos_panel_ui_test: set reference on the Trade Condition

master/bt5/slapos_panel_ui_test/ExtensionTemplateItem/portal_components/extension.erp5.SlapOSPanelUiTest.py

@@ -56,7 +56,7 @@ def ERP5Site_bootstrapSlapOSPanelTest(self, step, scenario, customer_login,
       # Sale trade condition
       trade_condition = portal.sale_trade_condition_module.newContent(
         portal_type="Sale Trade Condition",
-        title="Test currency",
+        reference="Test currency",
         price_currency_value=currency,
         source_value=organisation,
         #source_section_value=organisation,