How To Fix FL105 - Use only the underscore (_) as a separator

SAP Error Message - Details

• Message type: E = Error

• Message class: FL - Function Builder messages

• Message number: 105

• Message text: Use only the underscore (_) as a separator

What causes this issue?

You used an invalid character when you entered the name of the function
module. Refer to the F1 help for the naming conventions for function
modules.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Enter a name consisting only of alphanumeric characters and possibly
one underscore.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message FL105 - Use only the underscore (_) as a separator ?

  The SAP error message FL105, which states "Use only the underscore (_) as a separator," typically occurs in the context of naming conventions for certain fields or identifiers in SAP, particularly when dealing with financial documents, account assignments, or other structured data inputs.
  Cause:
  The error is triggered when a user attempts to use characters other than the underscore (_) as a separator in naming conventions. This can happen in various scenarios, such as:
  
  When entering a name for a financial document, account, or other identifiers that require a specific format.
  When using special characters, spaces, or other punctuation marks that are not allowed in the naming convention.
  
  Solution:
  To resolve the FL105 error, follow these steps:
  
  
  Check Naming Conventions: Ensure that you are using the correct naming conventions as specified by your organization's SAP guidelines. Only use underscores (_) as separators.
  
  
  Modify Input: If you have entered a name or identifier that includes invalid characters (like spaces, hyphens, or other punctuation), modify it to replace those characters with underscores. For example:
  
  Change Account-123 to Account_123
  Change Sales Order 456 to Sales_Order_456
  
  
  
  Review Documentation: If you are unsure about the naming conventions, refer to the relevant SAP documentation or consult with your SAP administrator or support team for guidance.
  
  
  Test Changes: After making the necessary changes, try to save or process the document again to see if the error persists.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes or Knowledge Base Articles related to error FL105 for any specific patches or updates that may address this issue.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  System Configuration: In some cases, the naming conventions may be influenced by system configuration settings. If the problem persists, it may be worth investigating whether any recent changes to the system configuration could be affecting naming conventions.
  
  By adhering to the specified naming conventions and ensuring that only underscores are used as separators, you should be able to resolve the FL105 error in SAP.