I just got off the phone with a very pleasant KLM reservation agent. I tried to book a flight with a stopover in Ams. On ITA I found some pretty good (schedule-wise and price-wise) flights in G with the stopover of 19 hours on the outbound. However, the agent told me that any stopover which is overnight books automatically into N or higher and in my case I would end up paying around 100 euros more. I thought that a stopover on an international flight, in my case all segments are within the EU, requires a stay in AMS of more than 24hours. But apparently any overnight stay on (short-haul) itinerary is for KL's reservation system regarded as a stopover.

Does anyone have the same experience (made recently)?