Updating Custom Fields on a Document Form

[ShaneG]

Hi everyone,

We have a custom form for a Document within a specific portfolio that I am looking to update the Record with. I am able to find the field within Update Record > Document. However I am receiveing a runtime error if [422] category cannot be null. My suspecion is that since the form doesn't default on the document until after you manually select it that Fusion that the Module doesn't see the fields to update on the document. Is there another step I am missing before this?