submitform not saving to CDS entity

[Caroline]

Since upgrading to CDSv2, I'm having issues with saving to entities.

Most screens invoke the OnSuccess command following Submitform, but the entity has not been updated. I also have one screen which gives the the error message "The requested operation is invalid. Server Response: A value must be provided for item" when submitform is used. I've checked all required fields are populated.

Does anyone know how to fix these issues?