I know this has been discussed before, but it is a very serious limitation for authors of character sheets who want to them to integrate with the API in any way. The 5eReShaped sheet, for example, has a companion script that can be used to import NPCs not available in the Compendium from a MM text format, but currently it doesn't work because changes don't propagate through the sheet when fields are set by the API. At the least it would be good to get some sort of idea whether a fix for this (as discussed here ) is in the pipeline soon, or whether this something that we have to work around for the foreseeable future; it is frustrating to put a lot of work into building hacky workarounds only to discover that a proper fix appears a week later!