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partiesGroupTags = new Array( 448, 447, 452, 2376 ); 
 
partiesNoCount = getNumField(453);
partiesGrp = getGroup(453);
partiesNewSize = partiesNoCount;
print("[DEBUG] Initial message has " + partiesNoCount.toString() + " parties"); // for debugging
if (0 < partiesNoCount && isGroupValid(partiesGrp))
{
 var i = 0;
 while (i < partiesNoCount && partiesNewSize > 0)
 {
  var partyRole = getNumField(partiesGrp, i, 452);
  if (partyRole == 17)
  {
   // Copy the last block to this position field by field if it exist
   for (var n=0; n < partiesGroupTags.length; ++n) 
   {
    if( i == partiesNewSize-1) // is this is the last block
    {
     removeField(partiesGrp, i, partiesGroupTags[n]);
    }
    else 
    {
     // partiesNewSize-1 - reference to the last block.
     lastBlockField = getStringField(partiesGrp, partiesNewSize-1, partiesGroupTags[n])
     currentBlockField = getStringField(partiesGrp, i, partiesGroupTags[n])
     print("[DEBUG] Current value of Field " + partiesGroupTags[n].toString() + " :" + currentBlockField + "   Last Field: " + lastBlockField ); // for debugging
     if ( lastBlockField != null && currentBlockField != null) // swap values with last group and clean it.
     {
      swapFields(partiesGrp, partiesNewSize-1, partiesGroupTags[n], partiesGrp, i, partiesGroupTags[n]); 
      removeField(partiesGrp, partiesNewSize-1, partiesGroupTags[n]);
     }
     else if ( lastBlockField != null) 
     {
      setStringField(partiesGrp, i, partiesGroupTags[n], lastBlockField ); // assumed only field that can be converted to string can be absent
     }
     else //  currentBlockField != null and should be removed.
     {
      removeField(partiesGrp, i, partiesGroupTags[n]);
     }
    }
   }
   --partiesNewSize;
   print("[DEBUG] Removed party block #" + i.toString() + " New parties size = " + partiesNewSize.toString() ); // for debugging
   // Do not increment i because copied block could have partyRole = 17 and should be rechecked. 
  }
  else
  {
   ++i;
  }
 }
 if (partiesNewSize > 0)
 {
  setNumField(453, partiesNewSize);
 }
 else // remove parties if there are no entries;
 {
  removeField(453);
 } 
 print("[DEBUG] New parties size = " + partiesNewSize.toString()); // for debugging
}