How To Fix MDC_GW_CUST005 - The node with the key &1 already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: MDC_GW_CUST - Customizing messages

• Message number: 005

• Message text: The node with the key &1 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 MDC_GW_CUST005 - The node with the key &1 already exists ?

  The SAP error message MDC_GW_CUST005, which states "The node with the key &1 already exists," typically occurs in the context of the SAP Master Data Governance (MDG) or when working with the SAP Gateway. This error indicates that there is an attempt to create or insert a node (such as a record or entry) in a data structure (like a hierarchy or tree) that already has an existing node with the same key.
  Cause:
  
  
  Duplicate Key: The most common cause of this error is that the key you are trying to use for a new node already exists in the system. This could happen if:
  
  You are trying to create a new entry with a key that has already been used.
  There is a data inconsistency or duplication in the source data.
  The system is trying to process a request that includes a duplicate entry.
  
  
  
  Data Model Issues: If the data model is not correctly defined or if there are issues with the configuration, it may lead to this error.
  
  
  Concurrency Issues: If multiple processes are trying to create or modify the same node simultaneously, it may lead to conflicts.
  
  
  Solution:
  
  
  Check for Existing Nodes: Before attempting to create a new node, check if a node with the same key already exists. You can do this by querying the relevant database table or using the appropriate transaction in SAP.
  
  
  Use Unique Keys: Ensure that the keys you are using for new nodes are unique. If necessary, modify the key generation logic to avoid duplicates.
  
  
  Data Cleanup: If there are duplicate entries in the system, you may need to clean up the data. This could involve deleting or merging duplicate records.
  
  
  Review Configuration: Check the configuration of your data model and ensure that it is set up correctly. This includes reviewing the definitions of nodes and their keys.
  
  
  Error Handling: Implement error handling in your application logic to gracefully manage situations where a duplicate key is encountered.
  
  
  Consult Documentation: Refer to SAP documentation or support notes related to the specific version of SAP you are using for any additional guidance or known issues.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific fixes or patches related to this error message.
  Transaction Codes: Use transaction codes like SE11 (Data Dictionary) or SE80 (Object Navigator) to investigate the data model and structures involved.
  Debugging: If you have access to the development environment, consider debugging the process to identify where the duplicate key is being generated or checked.
  
  If the issue persists after trying the above solutions, it may be beneficial to reach out to SAP support for further assistance.