A proposal is not yet a posting
On their own product page for Exact Online (updated October 2024), Elvy describes that it makes a booking proposal and creates the posting in Exact Online after you approve it. Glimps goes one step further. It picks the invoice up by itself, reads every line, picks GL account, VAT code and cost centre from what you posted before, lays the lines next to your purchase order and receipt and posts it by itself, once that supplier has earned your trust. It can do that because Glimps is built only for Exact Online: suppliers, journals, projects, orders and receipts come straight out of it.