I believe did try updating through the CTGYPA object before, but I might have missed something. I'd really appreciate it if you could take a look tomorrow and see if you can get it working. Thanks!

For anyone facing a similar challenge, here's how I managed to update customExpression values --It turns out you do need to update the Category object, and unfortunately, it requires including all CategoryParameters, even those without custom expressions. I haven't found a more efficient method yet....

Hey all,I'm trying to update customExpression values (those calculation fields in Calculated form for Custom Forms) through the API. Looks like I can't update CTGPEX directly.Is going through the Category object the only option? Seems a bit much to update all CategoryParameters when I only need to c...