How To Fix VT559 - Please enter a module pool between 'N' and 'Z'.

SAP Error Message - Details

• Message type: E = Error

• Message class: VT - Vertriebstabellen

• Message number: 559

• Message text: Please enter a module pool between 'N' and 'Z'.

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message VT559 - Please enter a module pool between 'N' and 'Z'. ?

  The SAP error message VT559, which states "Please enter a module pool between 'N' and 'Z'," typically occurs when you are trying to create or modify a module pool in the SAP system, and the name you have provided does not conform to the naming conventions for module pools.
  Cause:
  
  Invalid Module Pool Name: In SAP, module pool names must start with a letter between 'N' and 'Z'. This is a restriction in the naming convention for module pools, which are used for dialog programming.
  Incorrect Input: The user may have mistakenly entered a name that starts with a letter outside the allowed range or used invalid characters.
  
  Solution:
  
  Check the Name: Ensure that the module pool name you are trying to enter starts with a letter between 'N' and 'Z'. For example, valid names could be 'N12345', 'P_MODULE', etc.
  Rename the Module Pool: If you have already created a module pool with an invalid name, you will need to rename it to comply with the naming conventions.
  Follow Naming Conventions: Always follow the SAP naming conventions for module pools and other objects. This includes using the correct prefixes and ensuring that the name is unique within the system.
  
  Related Information:
  
  SAP Naming Conventions: Familiarize yourself with SAP's naming conventions for various objects, including module pools, function groups, and programs. This will help avoid similar errors in the future.
  Transaction Codes: The error may occur in various transactions related to ABAP development, such as SE80 (Object Navigator) or SE38 (ABAP Editor).
  Documentation: Refer to SAP documentation or help resources for more information on module pools and their usage in dialog programming.
  
  If you continue to experience issues after following these steps, consider reaching out to your SAP Basis or ABAP development team for further assistance.