Every invoice that you create will have an automatically created packing list. To view this packing list, click on the packing list toolbar button situated on the far right of the toolbar as a group named 'Activity'. The screenshot below shows the relevant toolbar group with the packing list button activated by the user.
When the packing list is active, you can print out the packing list. To continue editing the invoice, click on the invoice editor toolbar button to the left of the packing list toolbar button.