New answers tagged metadata
Two things: Your metadata type is wrong. It should be SP.Data.ChangeOfAddressListListItem. The format is SP.Data.(list name)ListItem or SP.Data.(library name)Item when adding or updating an item. You are missing some headers. A POST request signals an add but you want to do an update. To tell SharePoint that you really want to do an update you need to send ...
Calculated columns can't go "vertically". You cannot create a calculated value that derives from another list item. You can only go "horizontally" meaning that you can only look at the data about the current item. The only other way to do it would be with a workflow or event receiver.
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