 var api = new Script.Util.WSProxy(); var importDef = {     Name: "CreatedDE_" + CAMPAIGN_NAME,     CustomerKey: NEW_GUID,     AllowErrors: true,     DestinationObject: { // DestinationObject?         CustomerKey: DE_KEY     },     RetrieveFileTransferLocation: {         CustomerKey: "ExactTarget Enhanced FTP"     },     UpdateType: "Overwrite",     FieldMappingType: "InferFromColumnHeadings",     FileSpec: FILE_NAME, // set CSV file name     FileType: "CSV" }; var res = api.createItem("ImportDefinition", importDef);  