How To Fix 0T128 - System &1 has transport routes, but no standard layer for it

0T128 - Overview

• Message type: E = Error

• Message class: 0T - WBO Configuration Editor / SE06

• Message number: 128

• Message text: System &1 has transport routes, but no standard layer for it

What causes this issue?

The system &V1& is the starting point for the consolidation routes. No
transportable transport layer or default transport layer has been
assigned to this system or to a client of this system. New packages and
Customizing settings are recorded in local requests.

System Response

This is a warning.

How to fix this error?

Check and if necessary, correct the default transport layer(s) for the
system &V1&.

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.

Smart SAP Assistant

• What is the cause and solution for SAP error message 0T128 - System &1 has transport routes, but no standard layer for it ?

  The SAP error message 0T128 indicates that the system has transport routes defined, but there is no standard layer associated with it. This typically occurs in the context of transport management within SAP systems, particularly when dealing with transport routes and layers.
  
  Cause:
  
  Missing Standard Layer: The error arises when the transport routes are configured, but the system does not have a standard layer defined for the transport routes. A standard layer is necessary for the transport system to know how to handle the transport requests.
  
  Configuration Issues: There may be issues in the configuration of the transport management system (TMS) or the transport routes themselves.
  System Landscape Changes: Changes in the system landscape, such as adding or removing systems, can lead to inconsistencies in the transport routes and layers.
  
  
  Solution:
  
  
  Define a Standard Layer:
  
  Go to the Transport Management System (TMS) configuration.
  Navigate to the transport routes and check if a standard layer is defined.
  If not, create