Hi Vishal,
Looks like error was occurring because the Tax calculation was not triggering in the system.
Kindly follow the below steps to resolve this issue.
1. 'Goods and Services Receipts' work center.
2. 'Purchase Orders to Be Delivered' view.
3. Show 'All Invoice Requests'
4. Search and select PO and click 'New Good and Service Receipt'
5. change the posting date other than original date. ( dummy change).
6. click enter.
7. again change posting date to original posting date.
8. Save it.
9. Press CHECK error is gone and you can proceed with the process.
Should resolve your issue.
Thanks
Lokesh Sharma