You buy raw materials, components, packaging and sub-assemblies from a supplier base that spans regions, brands and plants. Your strategic suppliers are on EDI. Many others confirm by email, update dates by phone and send invoices as PDFs. When a commit date slips and nobody records it, the first sign is a line that can’t run or a customer order that ships late.
For a manufacturer, procure to pay isn’t paperwork. It decides whether you can build what you promised.