Have you ever used SAP Ariba?

Numerous large American tech companies are using that for supplier, including Intel, Google or ARM. They used to have their own system, and they moved to that abomination.

Everything is counter-productive, the UX is insane, but to give you an idea: you have a list of PO or invoices, but you cannot click on them to see them, you have a three-dot menu that allows you to get an email to "act on the PO"... They broke the simple idea of an hypertext link... I'm not even talking about changing a bank account...