How To Fix OIUPR851 - Network structure error (check MP &

SAP Error Message - Details

• Message type: E = Error

• Message class: OIUPR - PRA Production Messages

• Message number: 851

• Message text: Network structure error (check MP &

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message OIUPR851 - Network structure error (check MP & ?

  The SAP error message OIUPR851, which indicates a "Network structure error (check MP &)," typically arises in the context of SAP's Project System (PS) or other modules that involve network planning and management. This error suggests that there is an issue with the network structure, which could be due to various reasons such as missing or incorrect data in the network, dependencies, or relationships between activities.
  Causes:
  
  Missing or Incorrect Data: There may be missing or incorrect data in the network activities, such as start and finish dates, dependencies, or resource assignments.
  Invalid Relationships: The relationships between tasks (e.g., finish-to-start, start-to-start) may not be correctly defined, leading to inconsistencies in the network structure.
  Network Deletion: If a network has been deleted or is in an inconsistent state, it can trigger this error.
  Incorrect Milestone Planning: If milestones are not properly linked to the network activities, it can cause issues.
  Configuration Issues: There may be configuration issues in the project system settings that affect how networks are structured and validated.
  
  Solutions:
  
  Check Network Structure: Review the network structure in the project. Ensure that all activities are correctly defined and that there are no missing links or dependencies.
  Validate Relationships: Go through the relationships between tasks and ensure they are valid and correctly set up. Adjust any incorrect relationships as necessary.
  Review Activity Data: Check the data for each activity in the network. Ensure that all required fields are filled out correctly, including dates, resources, and costs.
  Recreate the Network: If the network is severely corrupted, it may be necessary to recreate it from scratch, ensuring that all data is entered correctly.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on network structures and common issues.
  Contact SAP Support: If the issue persists and cannot be resolved through the above steps, consider reaching out to SAP support for further assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CJ20N (Project Builder) or CN41 (Network Overview) to analyze and manage project networks.
  SAP Notes: Check for any SAP Notes related to this error message, as they may provide specific fixes or patches.
  Training and Documentation: Consider training resources or documentation on SAP Project System to better understand network planning and management.
  
  By following these steps, you should be able to identify and resolve the underlying issues causing the OIUPR851 error in your SAP system.