How To Fix FL706 - Function modules beginning with 'Y_' or 'Z_' are reserved for customers

SAP Error Message - Details

• Message type: E = Error

• Message class: FL - Function Builder messages

• Message number: 706

• Message text: Function modules 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 FL706 - Function modules beginning with 'Y_' or 'Z_' are reserved for customers ?

  The SAP error message FL706 indicates that you are trying to use a function module that begins with 'Y' or 'Z', which are reserved for customer-specific developments. This is a common restriction in SAP systems to ensure that standard SAP function modules are not overwritten or modified by customer code.
  Cause:
  
  Use of Custom Function Modules: The error occurs when a program or function tries to call a function module that starts with 'Y' or 'Z'.
  Missing or Incorrect Implementation: The function module may not be implemented correctly, or it may not exist in the system.
  Namespace Conflict: The function module might be incorrectly named or might conflict with standard SAP naming conventions.
  
  Solution:
  
  Check Function Module Existence: Verify if the function module you are trying to call actually exists in the system. You can do this by navigating to transaction SE37 (Function Builder) and searching for the function module.
  Correct Naming: Ensure that the function module is correctly named and follows the naming conventions. If you are developing a new function module, make sure it starts with 'Z' or 'Y' as per your organization's naming standards.
  Implementation: If the function module is supposed to be custom-developed, ensure that it has been implemented correctly. If it is missing, you may need to create it or ask your development team to do so.
  Check Authorization: Ensure that you have the necessary authorizations to access the function module. Sometimes, access restrictions can lead to such errors.
  Debugging: If you are calling the function module from a program, check the code for any logical errors or incorrect calls that might lead to this error.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific guidance or updates related to the error message FL706.
  Development Guidelines: Familiarize yourself with SAP's guidelines for custom developments to avoid conflicts with standard functionality.
  Transport Requests: If you are working in a development environment, ensure that your changes are properly transported to the quality or production environment.
  
  If the issue persists after checking the above points, it may be beneficial to consult with your SAP Basis or development team for further assistance.