To enable purchase order, sales order, and job order processing in Tally.ERP 9, you have to activate the required features in F11: Features ( F2: Inventory Features ).
Enable the following features in the Order Processing section:
● Enable purchase order processing
● Allow Sales Order Processing
● Enable job order processing
Note: When Enable job order processing is set to Yes , the options Maintain multiple Godowns and Use material in and out vouchers get enabled automatically.