How To Fix MPE_OAN001 - More than one start event exists in this operation activity network

SAP Error Message - Details

• Message type: E = Error

• Message class: MPE_OAN - Operation Activity Network Messages

• Message number: 001

• Message text: More than one start event exists in this operation activity network

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message MPE_OAN001 - More than one start event exists in this operation activity network ?

  The SAP error message MPE_OAN001 indicates that there is an issue with the operation activity network in the context of production planning or project management. Specifically, it means that there is more than one start event defined for a particular operation activity network, which is not allowed.
  Cause:
  The error typically arises due to the following reasons:
  
  Multiple Start Events: The operation activity network has been incorrectly configured with more than one start event. In a valid network, there should only be one start event to initiate the process.
  Data Entry Errors: During the creation or modification of the operation activity network, multiple start events may have been inadvertently defined.
  Configuration Issues: There may be issues in the configuration of the network or the way the operations are linked.
  
  Solution:
  To resolve the error, you can take the following steps:
  
  
  Review the Operation Activity Network:
  
  Go to the transaction code related to the operation activity network (e.g., CNO1 for creating or CNO2 for changing).
  Check the structure of the network and identify the start events.
  
  
  
  Identify and Remove Extra Start Events:
  
  Ensure that there is only one start event in the network. If you find multiple start events, determine which one should remain and remove the others.
  You can do this by editing the network and adjusting the event assignments.
  
  
  
  Check Dependencies:
  
  Review the dependencies and relationships between the activities in the network to ensure they are correctly defined.
  
  
  
  Validate Changes:
  
  After making the necessary adjustments, validate the network to ensure that it is correctly configured and does not produce any errors.
  
  
  
  Consult Documentation:
  
  If you are unsure about the configuration, refer to SAP documentation or guides related to operation activity networks for best practices.
  
  
  
  Seek Help from SAP Support:
  
  If the issue persists after following the above steps, consider reaching out to SAP support for further assistance.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CNO1, CNO2, and CNO3 for creating, changing, and displaying operation activity networks.
  SAP Notes: Check for any SAP Notes related to this error message for additional insights or patches that may address the issue.
  Training and Documentation: Consider training sessions or documentation on production planning and project management in SAP to better understand the configuration of operation activity networks.
  
  By following these steps, you should be able to resolve the MPE_OAN001 error and ensure that your operation activity network is correctly configured.