You could build business software today in which an AI writes the invoices. It would be right most of the time. For an invoice, though, "most of the time" is not enough: across a thousand invoices a month, one would eventually be wrong, it would look just like the others, and nobody could explain why that one.
That is why invoices, billing and figures in teamspace are produced by rules. The rules are stored, traceable and run the same way every time. If a rule is wrong, you find it and fix it, and from then on it is right for good. The AI may take a look and ask: "This project has been billed for three months without the framework agreement discount, although the client has one. Sure?" Whether it has a point is for a person to decide.
Where AI beats any rule, teamspace is glad to use it: condensing long histories, spotting anomalies in a report and explaining things in full sentences. These are tasks where you can judge the result at a glance.