I'm putting UK, which is where I board for the start of my journey on one booking reference. I also printed my e-ticket. As the airline requested that. I decided putting the transit airport looked like I came from that country, so not going to do it that way.
You started the pointless thread. I replied to someone said they'd "never been asked" and I suggested it's best not to rely on others claims. . .You jumped in to start non stop demands to know what rules are in place and where. Even when I told you, there were more demands to know where. Bizarre.