How To Fix TO129 - Namespace &1 is reserved for generated objects

SAP Error Message - Details

• Message type: E = Error

• Message class: TO - Transport Organizer and Tools

• Message number: 129

• Message text: Namespace &1 is reserved for generated objects

What causes this issue?

The object &V2& &V3& is in namespace &V1&, which is reserved for
generated objects. This object cannot be edited since it is not flagged
as a generated object in the object directory.

System Response

The function terminates.

How to fix this error?

Choose an object name that does not begin with &V1&.
Also do not assign the object to a package that begins with &V1&.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message TO129 - Namespace &1 is reserved for generated objects ?

  The SAP error message TO129 indicates that a namespace is reserved for generated objects, which typically means that you are trying to create or modify an object (like a table, function module, or class) in a namespace that is not allowed for user-defined objects. This is common in SAP systems where certain namespaces are reserved for SAP's own development or for specific applications.
  Cause:
  
  Reserved Namespace: The namespace you are trying to use is reserved for SAP or for generated objects. In SAP, namespaces are often prefixed with specific letters (like /SAP/ or /ABAP/) that indicate they are reserved.
  Development Class: If you are trying to create an object in a development class that is not allowed for user-defined objects, you will encounter this error.
  Transport Layer: The transport layer may also restrict certain namespaces to prevent unauthorized changes.
  
  Solution:
  
  Use a Different Namespace: If you are developing custom objects, use a custom namespace that you have created or that is available for your use. Custom namespaces typically start with a specific prefix (like Z or Y).
  Check Development Class: Ensure that the development class you are using is appropriate for the type of object you are trying to create. If it is a reserved class, switch to a user-defined development class.
  Consult Documentation: Review the SAP documentation or your organization's development guidelines to understand which namespaces are available for your use.
  Contact Basis Team: If you believe you need access to a reserved namespace for legitimate reasons, contact your SAP Basis team or system administrator to discuss the possibility of obtaining access or to clarify the restrictions.
  
  Related Information:
  
  Namespaces in SAP: SAP uses namespaces to organize and manage objects within the system. Understanding how namespaces work is crucial for effective development.
  Development Guidelines: Organizations often have specific guidelines for naming conventions and the use of namespaces. Familiarize yourself with these to avoid conflicts.
  Transport Management: If you are working in a transport environment, be aware of how transport layers and routes can affect your ability to create or modify objects.
  
  By following these steps, you should be able to resolve the TO129 error and continue with your development work in SAP.