«Changed by another user - refresh and try again» - the record was changed while you were editing it. Refresh the data and try again.
«The box was changed by another user - refresh and try again» - the box was changed by another member.
«The measurement was changed by another user - refresh and try again» - the measurement was changed by another member.
«The period was changed by another user - refresh and try again» - the solution period was changed by another member.
«Invalid If-Match header: a revision number is expected» - the app sent a wrong version mark of the record. Refresh the page; if it repeats - write to support.