Hey all, I have a suitelet with a sublist. One of the sublist select fields is set to source from the items list, but there are a few options i don't want the user to be able to pick. Specifically, i want to remove matrix parent items from the options. Is it possible to filter these out, or am I forced to validate the option in a client script?

Validation is going to be easiest. Otherwise, you'd need to dynamically add your select options.