Query:

I am importing Sales/Purchase Vouchers with StockItems  using one of the Standard templates provided with udi-Magic. For a specific voucher in the XLS file, the UOM is specified as "Nos", but when I check the entry imported in Tally, it shows the UOM incorrectly as "Kgs".

Ans:
This would happen if the StockItem already exists in Tally with UOM as Kgs.

You must manually change the UOM in the StockItem Master. And this is only possible if there are no vouchers entries for that StockItem.