User &1 cannot execute command

What causes this issue?

An error occurred in the TMS communication layer of the following SAP
system:
System: <LS>&V2&</>
Function: <LS>&V3&</>
Error: <LS>&V4&</>

System Response

The function terminates.

How to fix this error?

Check the authorization of the user for the specified system and extend
it if necessary.

Error message extract from SAP system. Copyright SAP SE.