The INFIELD attribute was added in Genero 2.20 but it is still surprising how much code I have seen that does not take advantage of it. A reminder that every time there is a new Genero version, we list the new features in the documentation. I would consider it good practise to periodically review your code base to take advantage of these new features.
The INFIELD clause allows you to simplify the code around only making an action apply to certain fields, and is typically seen with zoom/lookup windows for BUTTONEDIT's.
Read more at
https://4js.com/ask-reuben/ig-91/