Filter Detail by Field on Page

I have a process that creates multiple orders from an Opportunity.  The orders are separated by a service location field (due to pricing and installation).  I need to filter a detail on the Order page by the service location on the order.  I tried using the filterMethod that I saw in an example, but it either doesn't filter or there is nothing returned at all.  Can anyone spot what I am doing wrong?

            "OpportunityProductDetailV2bd737a92": {
                "schemaName": "OpportunityProductDetailV2",
                "entitySchemaName": "OpportunityProductInterest",
                "filter": {
                    "detailColumn": "Opportunity",
                    "masterColumn": "Opportunity"
                }
                "filterMethod": "productLocationFilter"
            }

		methods: {
			productLocationFilter: function(){
				var filterGroup = new Terrasoft.createFilterGroup();
				filterGroup.logicalOperation = Terrasoft.LogicalOperatorType.AND;
				var recordId = this.get("[Opportunity].Id");
				//var orderId = this.get("Id");
				//var serviceLocationForOrder = this.get("AtsServiceLocation").value;
				var esqOpportunity = Ext.create("Terrasoft.EntitySchemaQuery", {
					rootSchemaName: "OpportunityProductInterest"	
				});
				esqOpportunity.addColumn("Opportunity");
				esqOpportunity.addColumn("AtsLocation.AtsAccAddress", "AtsAccAddress");
				var oppFilter = esqOpportunity.createColumnFilterWithParameter(Terrasoft.ComparisonType.EQUAL, "Id", recordId);
				var OppId = "";
				var LocationId = "";
				esqOpportunity.filters.add(oppFilter);
				esqOpportunity.getEntityCollection(function(result) {
					//var respString = "";
					result.collection.each(function (item) {
						//respString += "ItemID: " + item.get("Opportunity").value + ";";
						OppId = item.get("Opportunity").value;
						LocationId = item.get("AtsAccAddress").value;
					});
					//window.alert(OppId + ", " + LocationId + ";" + serviceLocationForOrder + "~" + orderId);	
				},  this);
 
				filterGroup.add("OpportunityFilter", 
					Terrasoft.createColumnFilterWithParameter(
						Terrasoft.ComparisonType.EQUAL, "Opportunity", OppId));
				//var locationId = this.get("AtsLocation");
				filterGroup.add("LocationFilter", 
					Terrasoft.createColumnFilterWithParameter(
						Terrasoft.ComparisonType.EQUAL, "AtsLocation", LocationId));
				//filterGroup.add("ServiceLocationFilter",
					//this.Terrasoft.createColumnFilterWithParameter(
						//this.Terrasoft.ComparisonType.EQUAL, "[Order.AtsServiceLocation].Id", serviceLocationForOrder));
				return filterGroup;
			}
		}