On changing the Handling Unit value by HU02 t.code, Object key(VEKP-VPOBJKEY) value automatically changing

Hello Experts,

I have one typical issue in WM.

I have a transfer order. Now I am creating the handling unit and assigning to the transfer order by the LH01 t.code.

If I see the data in VEKP table the value of the field VEKP-VPOBJKEY is combination of the warehouse number and TO number.

For example: Warehouse number = WH1 and transfer Order = 5329598553. Object key(VEKP-VPOBJKEY) = WH15329598553.

Now the issue is, when I change the tare weight or any value of the HU by HU02 t.code, the object key(VEKP-VPOBJKEY) value automatically changing and the value is a random number.

My question here is why the object key(VEKP-VPOBJKEY) value changing automatically by the system, when I change the any value in of HU and why it is a random number.

Thanks in advance....