Hi, all. I've been using a REST PATCH call to update our item fulfillments after they ship for a few months now. I discovered today that the value I'm passing to the Ship Date field (id=shippeddate) isn't updating. It seems to default to the day I run the PATCH and even after the fact I cannot update it. There is no error on the PATCH. Using a string value with "yyyy-mm-dd" format. Anyone encounter this or know why it isn't taking my update?

those are read only fields