Hi Ankush,
I had the same problem. My problem was with "Goods Movement Bin Determination".
I think this problem occurs if your settings for POSC and Goods movement bin determination are incorrect.
Goods Movement Bin in Inbound Delivery –Item level should be determined automatically.
For this, you can set the WPT – source storage type and source storage bin (example- 9030 + Door_bin)
In POSC settings, make sure for your VAS step, the source storage type is either 9030 (because Goods movement bin is from 9030) or empty.
Regards,
Shashidhar