How does “Where the records come from” work on the Suppliers page?

Contact Harmonisation reads every organisation's contacts, matches them on company number, VAT number, bank details, email domain and name, and keeps one golden record per real supplier with the member contacts under it. The figures on each row are the card's own: spend is the group's bills to that supplier in the financial year, outstanding is net of credit notes, and the last bill is the newest in any organisation. They are recomputed nightly; the Last recomputed column says when. Where: Suppliers (/accounts/suppliers).