It was not possible to switch to channel &1

What causes this issue?

You have attempted to switch to channel &V1& in the display mode.
However, you do not have authorization for this. You could also not
switch to the change mode as this is currently being locked by another
user.

System Response

How to fix this error?

You could possibly try again later to switch to channel &V1& in the
change mode.
Where necessary inform your system administrator, in order to arrange
your authorizations.

Error message extract from SAP system. Copyright SAP SE.