How To Fix GHO_ALLOC_UI001 - Network object header rule already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: GHO_ALLOC_UI - Message Class for UI for Allocation

• Message number: 001

• Message text: Network object header rule already exists

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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message GHO_ALLOC_UI001 - Network object header rule already exists ?

  The SAP error message GHO_ALLOC_UI001 with the description "Network object header rule already exists" typically occurs in the context of project management or network planning within SAP, particularly when dealing with network activities and their associated rules.
  Cause:
  This error usually arises when you attempt to create or modify a network object (such as a project network or activity) that has a header rule already defined. The system does not allow duplicate header rules for the same network object, which leads to this error message.
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Existing Rules: 
  
  Navigate to the relevant network object in SAP and check the existing header rules. You can do this by accessing the network in transaction codes like CN21 (Create Network) or CN22 (Change Network).
  Look for any existing header rules that may conflict with the new rule you are trying to create.
  
  
  
  Modify or Delete Existing Rules:
  
  If you find that a header rule already exists, you can either modify it to meet your requirements or delete it if it is no longer needed.
  Ensure that the changes you make do not violate any business logic or project requirements.
  
  
  
  Consult Documentation:
  
  Review the SAP documentation or help files related to network planning and header rules to understand the constraints and requirements for creating or modifying these rules.
  
  
  
  Check Authorizations:
  
  Ensure that you have the necessary authorizations to make changes to network objects and their rules. Lack of proper permissions can sometimes lead to unexpected errors.
  
  
  
  Contact SAP Support:
  
  If you are unable to resolve the issue through the above steps, consider reaching out to your SAP support team or consulting SAP Notes for any known issues or patches related to this error.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CN21, CN22, CN24 (Display Network), and CJ20N (Project Builder) for managing networks and projects.
  SAP Notes: Search for SAP Notes related to GHO_ALLOC_UI001 for any specific fixes or updates that may address this error.
  User Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.