User & is already editing the dynpro & &

What causes this issue?

The screen is currently being edited by user &V1&.

System Response

You go into display mode where no changes can be made.

How to fix this error?

In emergencies, you can remove the lock using Transaction SM12, but
this is dangerous and can result in inconsistencies. An entry is thus
made in the system log.

Error message extract from SAP system. Copyright SAP SE.