Recently when my family traveled from Rome to Paris we encountered a problem. We went from Dubai to Rome by Qater Airways. We had a booking in Kuwait AIrways for travel from Rome to Paris. But we were not allowed to board the flight as our visa was single entry and Kuwait Airways was a non-Shengen country flight. As it was evening we had to buy tickets on Vueling Air for Euros 1300 ( 4 tickets) to continue our trip. This was a waste of money and the tickets booked on Kuwait Airways was also a waste (Euros 400). Please take care to verify such details while traveling. All my careful planning, scheduling trips in the 2 cities seemed a big waste. Luckily our family thorougly enjoyed the trip to Rome and Paris.