Chosen request/task was deleted while program was running

What causes this issue?

In the process of adding an SAP object to a Transport Organizer
request/task for editing, an SAP lock was applied to the data of the
selected request or to a task assigned to the request.
The request/task has the number &V1&.
After the lock was applied to the data, it became apparent that this
request/task had already been deleted.
Request/task number &V1& was probably deleted by another user.

System Response

The function terminates.

How to fix this error?

You can repeat the last action performed. If the error occurs
repeatedly, inform your system administrator.

Error message extract from SAP system. Copyright SAP SE.