Change Location before Qty Invoiced in Purchase

Hi All,
i have a question regarding purchase receipt
so lets say i create purchase order for 1 item
Item A Qty Order = 10
I receive this item partially
1st Receipt --> Location BLUE
2nd Receipt --> Location GREEN
3rd Receipt --> Location SILVER

note : we cant invoiced this receipt regarding company policy, so is there a way to this?
maybe we can create as 3 different lines, but the problem here is... we dont know this item will be distributed to which location until we receipt

I just imagine, i change the code in Table 39 (Purchase Line)
on user validate "Location Code", i block this code

Location Code - OnValidate()
//TestStatusOpen;
IF xRec."Location Code" <> "Location Code" THEN BEGIN
  IF "Prepmt. Amt. Inv." <> 0 THEN
    IF NOT CONFIRM(Text046,FALSE,FIELDCAPTION("Direct Unit Cost"),FIELDCAPTION("Location Code")) THEN BEGIN
      "Location Code" := xRec."Location Code";
      EXIT;
    END;
  //TESTFIELD("Qty. Rcd. Not Invoiced",0);
  //TESTFIELD("Receipt No.",'');
  //TESTFIELD("Return Qty. Shipped Not Invd.",0);
  //TESTFIELD("Return Shipment No.",'');
END;

i tried it, and it works... but is there any implication for the future if i do this?
thanks for the advice