The invention relates to the reliable and fast deferred detection of unscanned articles at self-service product detection stations. For this purpose, a camera is mounted on the weighing scale, so that articles which have not been scanned can be registered. The camera is activated when the weight indication of the weighing scale changes without an article having been scanned. The camera consequently registers the article last placed on the weighing scale and transmits this image to the display of an operator, who is informed about the article not scanned in and can correspondingly ask the customer to detect retroactively the article that has inadvertently not been detected.