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https://help.tallysolutions.com/docs/te9rel51/Voucher_Entry/Order_Processing/Alter_Delete_Purchase_Order.htm

Altering and Deleting a Purchase Order

To alter a Purchase Order,

Go to Gateway of Tally > Display > Day Book

Or

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

 Make the necessary alterations and save.

Deleting a Purchase Order

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