The Service Desk of supplier X continuous receives the same incident report. This concerns the latest version of a client-server application. The problem no longer occurs if the former version is…

The Service Desk of supplier X continuous receives the same incident report. This concerns the latest version of a client-server application. The problem no longer occurs if the former version is re-installed. Because the cause of the incident has still not been traced, the supplier decides to advise the customers to temporarily install the old version, if the problem occurs. What is this advice an example of?