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On the screenshot below you can see a Purchase Order with 2 order lines and the summary which shows Net amount, Tax amount and Order total (Gross amount).
Scroll down the Purchase Order frame and you'll see Approvals section which currently looks like this:
This means that the order must be approved by user PO Approver who has approval limit USD 50000 and currently the order is not approved yet (N/A). Approvers are assigned automatically based on Department value of current Purchase Order. Here's how it works:
