Fields on a list are not editable due to error: Security prevents writing to this fieldDescription When attempting to edit fields (cells) on a list, it is not possible and an error message appears: "Security prevents writing to this field" Release or EnvironmentAll releasesCauseThis can be caused by the field set to read-only either on the dictionary level or a dictionary override.ResolutionFollow the steps below: Navigate to System Definition > DictionaryFind the record for the field and table affectedUncheck the Mandatory checkboxNote: If you can't find the field on the table affected, you may need to go to the parent tableIn the related list, you will see the Dictionary Overrides tabFind the child table and open the recordUncheck Override mandatory checkbox