1.7 and 1.8 again, in buyer's clothes. Approve purchase orders is its own permission, separate from the posting permissions for receipts, invoices and payments: the person who commits the company to spend need not be the person whose posting brings stock in or sends money out. Hand-offs — an order awaiting approval, a receipt awaiting its invoice, an invoice awaiting payment — surface through the bell and in the cockpit's findings, so a stage waiting on a person is visible rather than forgotten in a tray.
With auto-post on, approving a goods receipt puts the stock on the shelf in the same act — available to promise, visible to Sales, valued with its landed costs — and approving an invoice records the payable at once. The discipline §1.8 names applies with interest here: approval is the last gate before the books move, and a refused posting (a closed period, a bank balance the payment cannot cover under your overdraft policy) returns the document to draft with the reason showing, never half-applied.