Hi, we're unable to create a new document using the migration API for a custom type called "book". Would appreciate the help.
1 - Type was created via Slicemahcine, published to our repo.
2 - Data and fields match, and I'm using the recommended htmlAsRichText helper from the migrate library.
400 could be a couple of different things - do you have an error with your title field in the first screenshot? Is this document the first of its kind in the book custom type, or do you have others already?