sorry, never needed a SETV. There's no actual 180 max limit in a year but they are more concerned about people trying to live in Thailand using the exempt entry over and over. So they get questioned or have difficulty. Perhaps if you have a SETV and all the proofs of being a tourist= hotel, flight out etc you'll be ok.
I put my UK flight number because that's where I'm coming from. I didn't put the flight no. for transit because my flight didn't originate there. Also, we had a delay and my second leg flight number was changed anyway.
yes, it's a mystery! Like those who ask about 90 day (continuous days) report and say they left before 90 days so do they need to do the report when back. 🤦