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Activities > Manage Purchase Orders You will need to be in the following Perspective to work with invoices;
First, find the purchase order that you want to Invoice.
When you click on the Purchase Order link you will see a screen similar to the one below.
When you click on the Upload Invoice button the following screen is displayed.
Enter your invoice reference code.
Select the invoice date.
Attach the invoice.
Optionally you can attach a URL for the invoice.
Optionally you can add notes about the invoice.
Click Save.
The invoice will then be visible in the Manage Invoice list view.