How To Fix FL707 - Function module name is reserved for SAP

SAP Error Message - Details

• Message type: E = Error

• Message class: FL - Function Builder messages

• Message number: 707

• Message text: Function module name is reserved for SAP

What causes this issue?

You attempted to create a function module with a name which lies in the
SAP naming range. This is not permitted because any future SAP upgrade
could cause your modification to be lost. Moreover, it could result in
inconsistencies in the system due to the internal numbering system used
when creating new function modules. You can only create new function
modules in the development system of the relevant function group.
Duplicate module numbers inevitably lead to inconsistencies and to
objects being overwritten during the next SAP upgrade. In addition, SAP
has a policy of strict separation between function groups containing
customer-specific functions and those containing SAP standard software.
Therefore, any function group which is to contain a customer-specific
function module must be created as a customer-specific function group.

System Response

How to fix this error?

The names you use for your own function modules should begin with
<LB>Y_</> or <LB>Z_</>. SAP has reserved this naming range specially
for customers' own use.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message FL707 - Function module name is reserved for SAP ?

  The SAP error message FL707, which states "Function module name is reserved for SAP," typically occurs when a user attempts to create or modify a function module in the SAP system using a name that is reserved for SAP's internal use. SAP reserves certain naming conventions and prefixes for its own function modules to avoid conflicts and ensure system integrity.
  Cause:
  
  Reserved Naming Convention: SAP has specific naming conventions for function modules, and names that start with certain prefixes (like 'Z' or 'Y' for custom developments) or names that are already in use by SAP are not allowed.
  Namespace Conflicts: If a developer tries to create a function module with a name that is already used by SAP or is reserved for future SAP use, this error will occur.
  
  Solution:
  
  Use Custom Naming: When creating a new function module, ensure that you use a name that starts with 'Z' or 'Y' (which are typically reserved for customer developments) and does not conflict with existing SAP function module names.
  Check Existing Function Modules: Before creating a new function module, check the existing function modules in the SAP system to ensure that the name you want to use is not already taken. You can do this by using transaction SE37 (Function Module) and searching for the name.
  Follow SAP Guidelines: Adhere to SAP's naming conventions and guidelines for custom developments to avoid such conflicts in the future.
  
  Related Information:
  
  Transaction Codes: Use transaction SE37 to view and manage function modules.
  SAP Notes: Check SAP Notes for any updates or specific guidelines related to function module naming conventions.
  Development Guidelines: Refer to SAP's development guidelines for best practices in naming and creating custom objects.
  
  If you continue to face issues or need further assistance, consider reaching out to your SAP Basis or development team for support.