You can create inventory delivery voucher by selecting invoice or available items or Purchase order ( if "It is mandatory to select a Purchase order when entering an Inventory delivery" is activated at General Setting - Receiving & Delivery. Purchase orders that have been approved and status is Completely Delivered will be selected to generate the inventory delivery voucher).
Prefix Settings
Summary Section:
Click to add the item to inventory delivery .
Click to remove the item from inventory delivery.
Go to menu Settings -> Receiving & Delivery tab-> check option “Create an inventory delivery voucher note when the Invoice is created: Inventory delivery voucher will be automatically created as soon as invoice is generated.