How To Fix RLB116 - Libraries beginning with Y or Z are reserved for customers

SAP Error Message - Details

• Message type: E = Error

• Message class: RLB - Reuse Library

• Message number: 116

• Message text: Libraries beginning with Y or Z are reserved for customers

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RLB116 - Libraries beginning with Y or Z are reserved for customers ?

  The SAP error message RLB116 indicates that you are trying to create or use a library (or a function module, program, etc.) that begins with the letters "Y" or "Z". In SAP, objects that start with these letters are reserved for customer-specific developments. This is a standard practice to differentiate between SAP standard objects and custom objects created by customers.
  Cause:
  The error occurs when:
  
  You attempt to create a new object (like a function module, program, or class) that starts with "Y" or "Z" but the naming convention is not followed correctly.
  You might be trying to access or modify an object that is not allowed due to naming restrictions.
  
  Solution:
  
  
  Check Naming Convention: Ensure that the object you are trying to create or modify adheres to the naming conventions. If you are creating a custom object, it should start with "Y" or "Z".
  
  
  Use Transaction SE80: If you are using the Object Navigator (SE80), make sure you are in the correct namespace for your custom development.
  
  
  Review Object Type: If you are trying to access an SAP standard object, ensure that you are not mistakenly trying to modify it. Standard objects should not be prefixed with "Y" or "Z".
  
  
  Authorization Check: Ensure that you have the necessary authorizations to create or modify objects in the SAP system.
  
  
  Consult Documentation: If you are unsure about the naming conventions or the specific object you are working with, refer to SAP documentation or consult with your SAP Basis or development team.
  
  
  Related Information:
  
  SAP Namespaces: SAP uses namespaces to manage object names. Objects starting with "Y" or "Z" are typically used for customer-specific developments, while standard SAP objects do not use these prefixes.
  Transport Requests: If you are working with transport requests, ensure that your custom objects are included in the correct transport request for proper deployment.
  Development Guidelines: Follow SAP's development guidelines to ensure that your custom developments are compliant with best practices.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or refer to SAP Notes for more specific guidance related to your system version.