OK, so I have a very basic SharePoint library with a document set content type. When I use the default form all works well. I am able to add the title, due date and a description. I then created a custom form (using Canvas) and publish the form. Back in the SharePoint library I click the New button and select the document set content type. I populate the title, due date and description fields; but when I try to save the set I get the error "Network error when using Patch function: The requested operation is invalid."
What does that mean, and what do I need to do to fix the reason the document set cannot be saved?

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