Can you solve this puzzle? I can pay for a consultation if needed

[jps1006]

I’d have to experiment with it to know for sure, but try this… set the Show Restaurants RG datasource to a search for RestMealPrice with a constraint where MealInRMP is in cart RG’s list of things :each items meal.
See this for more info on filtering lists from lists in case my suggestion is wrong: (see entry #3) She breaks it down well (which is why I bookmarked it)

Advanced filter - multi constraints context

Hi Thomas, There are specific constraint operators that need to be used for single vs list values: Element vs Element Let’s say a User’s Name = Thomas and the input’s value = Thomas Jones Name = Input’s value > would not return the record because it’s not an exact match Name is in Input’s value > would return the record because the word “Thomas” is in the value “Thomas Jones” Element vs List Let’s say a User’s Name = Thomas and a custom state (list)'s value = Adam, Mary, Thomas Name = …