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<@U4LCPRS3S> And if you're using a custom record you will need to make sure to pass the record into the template render as well, along with a "templateName" to use as part of the replacement, or if you have more than one, as a custom Data Source with an alias:
		var templateFile = file.load({id: templateID});
		var renderer = render.create();
		renderer.templateContent = templateFile.getContents();
		var customerRec = record.load({type: record.Type.CUSTOMER, id: customerID});
		renderer.addRecord({templateName: 'maincust', record: customerRec});
		renderer.addRecord({templateName: 'rep', record: record.load({type: record.Type.EMPLOYEE, id: repID})});
		var items = {};
		items.list = []  //Lookup your list of custom records here.
		renderer.addCustomDataSource({format: render.DataSource.OBJECT, alias: 'itemList', data: items});