1) Create a compatible group with one or more resources in it that support plugin configuration (this probably happens for resource config too)

2) Go to the group's Inventory>Connection Settings view

3) Click the pencil to edit one group config property

4) Type something in the "Set all values to:" text field

Notice a globally uncaught exception during step 4:

java.lang.IllegalStateException:PropertySimple[id=0, name=Pathname, value=j, override=true] has no parent.
--- STACK TRACE FOLLOWS ---
PropertySimple[id=0, name=Pathname, value=j, override=true] has no parent.
...
    at Unknown.org_rhq_enterprise_gui_coregui_client_components_configuration_GroupConfigurationEditor_$getProperty__Lorg_rhq_enterprise_gui_coregui_client_components_configuration_GroupConfigurationEditor_2Lorg_rhq_core_domain_configuration_Configuration_2Lorg_rhq_core_domain_configuration_Property_2Ljava_lang_Integer_2Lorg_rhq_core_domain_configuration_Property_2(Unknown source:0)
    at Unknown.org_rhq_enterprise_gui_coregui_client_components_configuration_GroupConfigurationEditor_updatePropertySimpleValue__Ljava_lang_Object_2Lorg_rhq_core_domain_configuration_PropertySimple_2Lorg_rhq_core_domain_configuration_definition_PropertyDefinitionSimple_2V(Unknown source:0)
    at Unknown.org_rhq_enterprise_gui_coregui_client_components_configuration_ConfigurationEditor$16_onChanged__Lcom_smartgwt_client_widgets_form_fields_events_ChangedEvent_2V
...