SAP Message 0T001 - Transport layer &1 does not start with "S"

Diagnosis
You entered a transport layer that does not start with 'S'.
The name of a layer for an SAP system must start with 'S'.
Sometimes SAP and customer systems are mixed, and transport layers thatstart with 'Y' and 'Z' exist.

System Response
A warning is triggered.

Procedure
Enter a transport layer that starts with 'S', or delete the transportroute and the transport layer. Create a new transport route with thenew transport layer.