How does “Ranking and the workbook” work on the Suppliers page?

The default order is by spend this financial year. Clicking the header of a ranked column asks the server to re-order the whole group, which is why page one is always the real top rather than the top of the rows already loaded; any other column sorts the page on screen. Top suppliers walks every page and writes the list as a workbook in the same order, so the ranking a board sees is the ranking on screen. Where: Suppliers (/accounts/suppliers).