function combindXml(putawaySheetXml, pickingTicketXml) {
  return `<?xml version="1.0"?><!DOCTYPE pdf PUBLIC "-//big.faceless.org//report" "report-1.1.dtd">
      <pdfset>
        ${putawaySheetXml}
        ${pickingTicketXml.map(pdf => pdf)}
      </pdfset>`;
}