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https://help.tallysolutions.com/docs/te9rel54/Voucher_Entry/Order_Processing/Alter_Delete_Purchase_Order.htm

Altering and Deleting a Purchase Order

In Tally.ERP 9, you can alter or delete a purchase order either from the Day Book or the Inventory Books.

To alter a Purchase Order

1.     Go to Gateway of Tally > Display > Day Book.

Or

1.     Go to Gateway of Tally > Display > Inventory Books > Purchase Orders Book.

2.     Make the necessary alterations.

3.     Press Enter to save.

Deleting a Purchase Order

To delete a Purchase Order, press Alt + D in the Purchase Order alteration screen.