As per the business process, The picker will take the materials from the source bin and pack the materials at the source bin. After packing, he will take the print out of the HU label and attach to the HU. Some times he need to change the tare weight of the HU and re print the label again.
After packing he will move the materials to the destination bin.
Below are steps that I am following.
1) Creating the Sales Order(VA01)
2) Creating the Delivery(VL01N)
3) Creating the transfer Order with Ref. to the Delivery(LT03)
4) Creating and assigning the HU to the Transfer Order by LH01 t.code
After the 4th step, when check the object key(VEKP-VPOBJKEY) value, it is a combination of warehouse number and TO number which is correct.
5) Changing the tare weight or any value in the HU by HU02 t.code
Now the object key(VEKP-VPOBJKEY) value automatically changing and the value is a random number.
Your valuable inputs are needed on this issue.