You can just press F12(Last Purchase Rate),F11(last Sale Rate) and F10(Last Purchase Rate for ant Ledger)in Rate box of Sale and Purchase transaction frame.
- Go to Transaction > Sale/Purchase (Open any one as per your requirement)
- Then select a Ledger.
- Select an Item which you want to sale or purchase.
- Then press F12 = It shows last purchase rate, F11 = It shows last sale rate and F10 = It shows last purcahse rate for any ledger in Rate box.