Partner opens 1NT (15-17), righty bids 2♥.
Okay, I know what I want to play... 3NT. So I bid 3NT.
Uh oh, partner alerts and explains upon inquiry: We play Lebensohl, this shows a GF hand without stopper. Suddenly you remember that the "Leb" in partner's profile is exactly that.
Doh! To play 3NT you must bid 2NT, then 3NT.
Who invented such horrors?
Alternatively I like what I learned from Polish players:
1N (2♥) 3N = To play
1N (2♥) 3♥ = Asks for stopper
1N (2♥) 2N then 3N = To play with 4♠
1N (2♥) 2N then 3♥ = Asks for stopper with 4♠
You don't get to vote for "Transfer Lebensohl" or "Rubensohl" here.

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