How To Fix XC451 - User &1 is generating an integration model in parallel

SAP Error Message - Details

• Message type: E = Error

• Message class: XC - Message Class for Core Interface

• Message number: 451

• Message text: User &1 is generating an integration model in parallel

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 XC451 - User &1 is generating an integration model in parallel ?

  The SAP error message XC451 indicates that a user is attempting to generate an integration model in parallel, which is not allowed. This typically occurs in the context of SAP's Master Data Integration (MDI) or when working with the SAP Application Interface Framework (AIF) and can lead to conflicts or data inconsistencies if multiple processes try to modify the same integration model simultaneously.
  Cause:
  
  Concurrent Execution: The error arises when the same user or multiple users try to generate the integration model at the same time.
  Locking Mechanism: SAP uses a locking mechanism to prevent data inconsistencies. If one process is already generating the integration model, other processes initiated by the same user will be blocked until the first process completes.
  
  Solution:
  
  Wait for Completion: The simplest solution is to wait for the current integration model generation process to complete. Once it finishes, you can attempt to generate the model again.
  Check for Active Processes: Use transaction codes like SM50 or SM66 to check for active processes. If you find a process that is stuck or taking too long, you may need to investigate further or terminate it if appropriate.
  Avoid Parallel Execution: Ensure that users are not trying to generate the integration model simultaneously. Implement guidelines or training to prevent this from happening.
  Review User Permissions: If multiple users need to generate integration models, consider reviewing and adjusting user permissions or roles to prevent conflicts.
  System Configuration: In some cases, system configuration or performance issues may lead to longer processing times. Review system performance and consider optimizing it if necessary.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as:
  
  SM50: Monitor active processes.
  SM66: Monitor global processes.
  SLG1: Check application logs for more details on errors.
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its knowledge base with solutions for common problems.
  Documentation: Review SAP documentation related to integration models and the specific module you are working with to understand best practices and limitations.
  
  If the problem persists after trying the above solutions, consider reaching out to your SAP Basis team or SAP support for further assistance.