Say you have a GF auction agreeing hearts, and pard bids 4NT. You've agreed to play 4S as keycard asking for hearts, so almost certainly pard has had a memory lapse and thinks you're playing normal RKCB. What are your options here? Assuming 4N has no meaning in your system, that would make pass unreasonable so you just have to bid 5H? Say then pard takes your 5H bid as two without the queen, thinks that looks great so bids 7H which makes. Have the opponents being damaged and are due some level of adjustment?