For each row of an Item list, check if empty

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Hello all!!

Does anyone configured a rule where the action goes on each row of an item list and if a row has option A for a specific column then column B cannot be empty?

There are some new functions for the item list but they only work as form rules and for action (even creating a business rule, form rules don't work as it needs to a TRUE/FALSE result).

Even using SQL Command I think it would only work for a subquery because I need to check the value on each row.
I've used the Select Values in combination with GetNames function but I was not successful with my idea!

Hope anyone has an idea on this!