How To Fix /IWFND/CM_MGW252 - For HTTP Header field '&1' MDC found different values during merge.

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/CM_MGW -

• Message number: 252

• Message text: For HTTP Header field '&1' MDC found different values during merge.

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 /IWFND/CM_MGW252 - For HTTP Header field '&1' MDC found different values during merge. ?

  The SAP error message /IWFND/CM_MGW252 typically occurs in the context of SAP Gateway and OData services. This error indicates that there is a conflict in the HTTP header field during the merge process, specifically related to the Multi-Dimensional Container (MDC) values. The error message suggests that the same HTTP header field has been found with different values, which leads to ambiguity in processing the request.
  Cause:
  
  
  Conflicting Header Values: The error arises when the same HTTP header field is present in multiple requests or responses with different values. This can happen if:
  
  Multiple clients are sending requests with different values for the same header.
  There are inconsistencies in the service implementation that lead to different values being set for the same header.
  
  
  
  Service Configuration Issues: Misconfiguration in the OData service or the underlying data model can also lead to this error.
  
  
  Concurrency Issues: If multiple requests are being processed simultaneously and they modify the same resource, it can lead to conflicts in header values.
  
  
  Solution:
  
  
  Check Header Values: Review the HTTP headers being sent in the requests. Ensure that the same header field is not being sent with different values across requests. If necessary, standardize the values being sent.
  
  
  Service Implementation Review: Examine the OData service implementation to ensure that it correctly handles the HTTP headers. Make sure that the logic for setting header values is consistent.
  
  
  Debugging: Use debugging tools to trace the requests and responses. Look for the specific header field mentioned in the error message and identify where the conflicting values are coming from.
  
  
  Concurrency Control: If the issue is related to concurrent requests, consider implementing locking mechanisms or other concurrency control strategies to prevent conflicts.
  
  
  SAP Notes and Support: Check for any relevant SAP Notes or updates that might address this issue. Sometimes, specific versions of SAP Gateway or OData services may have known issues that are resolved in later patches.
  
  
  Related Information:
  
  SAP Gateway: This is the technology that allows you to connect devices, environments, and platforms to SAP systems. Understanding how it handles requests and responses can help in troubleshooting.
  OData Services: Familiarize yourself with how OData services work, including the structure of requests and responses, as well as how headers are managed.
  HTTP Protocol: A basic understanding of HTTP and how headers work can also be beneficial in diagnosing issues related to header conflicts.
  
  If the problem persists after trying the above solutions, consider reaching out to SAP support for further assistance, providing them with detailed logs and information about the requests that are causing the error.