How To Fix KW391 - Parameter or function name &1 already exists.

SAP Error Message - Details

• Message type: E = Error

• Message class: KW - CO-ABC Activity-Based Costing

• Message number: 391

• Message text: Parameter or function name &1 already exists.

What causes this issue?

The external parameter name or function name &V1& already exists for
parameter or function &V4& in namespace &V2& of environment &V3&.
External parameter name and function name must be unique for the same
ABAP/4 parameter or logical function.

System Response

The name cannot be transferred.

How to fix this error?

Change the name.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message KW391 - Parameter or function name &1 already exists. ?

  The SAP error message KW391, which states "Parameter or function name &1 already exists," typically occurs when you are trying to create a new parameter or function in the SAP system that has the same name as an existing one. This can happen in various contexts, such as when defining custom parameters in transaction codes or when working with function modules.
  Cause:
  
  Duplicate Name: The most common cause is that the name you are trying to use for a parameter or function is already in use by another parameter or function in the system.
  Namespace Conflicts: If you are working in a development environment, there may be conflicts with existing objects in the same namespace.
  Transport Issues: If you are transporting objects between systems, there may be a conflict with existing objects in the target system.
  
  Solution:
  
  
  Check Existing Parameters/Functions: Before creating a new parameter or function, check the existing ones to ensure that the name you want to use is not already taken. You can do this by:
  
  Using transaction codes like SE11 (Data Dictionary), SE37 (Function Modules), or SE80 (Object Navigator) to search for existing objects.
  Searching for the name in the relevant namespace or package.
  
  
  
  Rename Your Parameter/Function: If you find that the name is already in use, consider renaming your parameter or function to something unique.
  
  
  Use a Unique Namespace: If you are developing custom objects, ensure that you are using a unique namespace or prefix that is less likely to conflict with existing objects.
  
  
  Transport Management: If the issue arises during a transport, ensure that the target system does not already have the object you are trying to transport. You may need to adjust your transport request or resolve conflicts before proceeding.
  
  
  Consult Documentation: If you are unsure about the naming conventions or the existing parameters/functions, refer to the SAP documentation or consult with your SAP Basis or development team.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SE11, SE37, SE80, and SE38 (for ABAP programs) to manage and search for existing objects.
  Naming Conventions: Follow SAP's naming conventions for custom objects to minimize the risk of conflicts.
  Development Guidelines: Adhere to your organization's development guidelines and best practices to avoid naming conflicts and ensure consistency across the system.
  
  By following these steps, you should be able to resolve the KW391 error and successfully create your parameter or function in SAP.