function getNomorPO(date) {
  var LastNoPOHdr;
  var LastNoPOTmp;
  var LastNo;
  var NewNo;

  db.executeSql("SELECT IFNULL(MAX(SUBSTR(po_no,10,5)),0) AS last_no FROM po_hdr WHERE strftime('%Y', po_date)=? AND strftime('%m', po_date)=?", [moment(date).format('YYYY'), moment(date).format('MM')], function(rs) {
    this.LastNoPOHdr = parseInt(rs.rows.item(0).last_no);
    console.log('No terakhir dari po_hdr : ' + this.LastNoPOHdr);

    db.executeSql("SELECT IFNULL(MAX(SUBSTR(po_no,10,5)),0) AS last_no FROM tmp_po_hdr WHERE strftime('%Y', po_date)=? AND strftime('%m', po_date)=?", [moment(date).format('YYYY'), moment(date).format('MM')], function(rs) {
      this.LastNoPOTmp = parseInt(rs.rows.item(0).last_no);
      console.log('No terakhir dari tmp_po_hdr : ' + this.LastNoPOTmp);

      if (this.LastNoPOHdr > this.LastNoPOTmp){
        this.LastNo = this.LastNoPOHdr + 1;
      } else {
        this.LastNo = this.LastNoPOTmp + 1;
      }

      console.log('this.LastNo : ' + this.LastNo);
      this.NewNo = CfgMDID + "-" + moment(date).format('YYYY') + moment(date).format('MM') + Lpad(this.LastNo, 5, 0);
    }, function(err) {
      alert(err.message);
    });

  }, function(err) {
    alert(err.message);
  });

  console.log('Nomor PO Baru : ' + this.NewNo);

  return this.NewNo;

}