Need HELP on Filtering

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I have a filter setup so that it displays data based on another field. The filter works fine, but now I have been tasked to filter on two fields. The original filter needed to go to a Relationship table to retrieve its data, the new filter field can filter directly on the result of the first filter. The Highlighted area is what I added to the original filter, now I’m stuck.

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///<SUMMARY>

///On Select Software, if there is a Model defined, only display Software defined as relationship in selected Model

///</SUMMARY>

///Get value from the source field///

var itm = inArgs.itemContext;

var model_id = top.aras.getItemProperty(itm,"model");

/// this is the new field I need to filter on///

var product_id = top.aras.getItemProperty(itm,"product");

if (!model_id){

                return;

}

///Select Relationship table to filter on source_id = model///

var softwareList = this.newItem("MIN_Model_Software_Catalog","get");

softwareList.setProperty("source_id",model_id);

softwareList = softwareList.apply();

///Store related_id’s in a Array///

var idArray = new Array();

for(var i = 0; i < softwareList.getItemCount() ; i++){

                idArray.push(softwareList.getItemByIndex(i).getProperty("related_id"));

}

///Filter Data///

inArgs.QryItem.item.setAttribute("idlist",idArray.join(","));

return("");

This is the result of the first filter. I  know need to filter on the highlighted

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