You are not authorized to change transaction &

What causes this issue?

You tried to switch to change mode in a transaction. You are not
authorized to do this.

System Response

The system does not allow you to switch to change mode.

How to fix this error?

If you should have authorization for change mode in this transaction,
contact your user administrator.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.