I was reading this article, creating records and related records using a process model, and I wondered if the code for the form interface, Case, referred to in the article is available on the Appian Community for reference.
I'm working on a form (proof-of-concept) which has a similar structure as the Case form, i.e. a base record type and an editable grid of related record type on the form.
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Building such a form is one of the most basic things you can do in Appian. Browse Interface Recipes and the patterns palette in the UI designer to get started.