10.	Cancelled purchase invoice in grid – show in a different colorshade
20.	Cancelled invoice – color change if given will be good
21.	Sales invoice cancellation block after sales return happen
Purchaseinvoice edit and cancellation block after purchase return happen
27.	Option to change both unit price and the final grid row (Reverse calculation)-done in purchase invoice and salesinvoice
17.	When the grid item is deleted, make the recalculation in vat and grand total etc. (In all places)-puchase,sales