UI Action calls Record Producer to navigate and pass variable values to preset onLoad

[Christine A]

I have a ui action that calls a record producer and passes a value to one of the variables and launches the record producer. However I am getting an error message when the record producer's onLoad Client script is called:

ReferenceError: RP is not defined
at presetFields (com.glideapp.service…sset_manager:865:15)
at onLoad_57060aeb87b40610739742e8cebb35bb (com.glideapp.service…asset_manager:870:1)
at com.glideapp.service…asset_manager:877:1
at js_includes_doctype.jsx:557:4
at runBeforeRender (js_includes_doctype.jsx:474:5)
at z_last_include.jsx:33:2
at z_last_include.jsx:39:3

-------------------------------

UI Action:

    var reqBy = 'asset_manager';

    var url = 'com.glideapp.servicecatalog_cat_item_view.do?sysparm_id=1297d75ba1617010fa9b20d39126489f';

        url += '&sysparm_requested_by=' + reqBy;

    g_navigation.open(url, '_blank');

-----------------------

On the Record Producer (Asset Reclamation Request ... ham and sam)

... onLoad client script:

function presetFields() {

 var reqBy = RP.getParameterValue('requested_by');

 RP.setValue('requested_by', reqBy);

};

presetFields();

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note the variable: 

The url it generates is: /com.glideapp.servicecatalog_cat_item_view.do?sysparm_id=1297d75ba1617010fa9b20d39126489f&sysparm_requested_by=asset_manager

Any help much appreciated.