A flowchart like this is useful for explaining exactly how to recognize the revenue from a purchase order.
Text in this example:
Does order comply with standards?
Review order for non-standard requirements by sales department
Purchase Order Received
Route to sales manager for review and negotiations
Route to CFO for approval
Route to Credit department for approval
Mail invoice to customer
Post to Ledger & generate invoice
Send acknowledgement of acceptance to customer
Review sales transaction for conformance to policies
Standard sales contract parameters defined