On the Incoming e-Invoice screen under Invoices you upload the XML file your supplier sent. The program parses it and shows the seller, the document number, the date, the total and every line on screen. Nothing is recorded up to this point; the file is only read.
The contact is found automatically by the seller’s tax number. If it cannot be found, no invoice is produced, because a purchase invoice whose creditor is unclear is not a record but a mess. Product matching is left to you: the screen suggests the seller’s own stock code and you decide which of your products it corresponds to.
Once you pick the warehouse the goods will enter and save, the purchase invoice is created and the stock and contact movements are written together. The same document number from the same contact is never imported twice; if you upload the same file by mistake, the program does not create a second record.