Not able to add items using barcode in POS, but works in sales order and purchase

when i fill the barcode number in search box of POS then that product is not getting search(no items), but when i do same for purchase or sales order it adds that item to the list. Pls help in this regard, thanks.
i have attached some screenshots below.




this also works in pos awesome, but not in this default pos of erpnext