/**
  * Sets package boxTypeId in an org.opentaps.warehouse.shipment.packing.PackingSession object.
  *
  * @param session An org.opentaps.warehouse.shipment.packing.PackingSession
  * @param packageBoxTypeIds
  */
 private static void setSessionPackageBoxTypeIds(
     PackingSession session, Map<String, String> packageBoxTypeIds) {
   if (UtilValidate.isNotEmpty(packageBoxTypeIds)) {
     Set<String> keySet = packageBoxTypeIds.keySet();
     for (String packageSeqId : keySet) {
       String packageBoxTypeId = packageBoxTypeIds.get(packageSeqId);
       if (UtilValidate.isNotEmpty(packageBoxTypeId)) {
         session.setPackageBoxTypeId(packageSeqId, packageBoxTypeId);
       } else {
         session.setPackageBoxTypeId(packageSeqId, null);
       }
     }
   }
 }