How To Fix MPE_OAN012 - No 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: 012

• Message text: No start event exists in this operation activity network

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 MPE_OAN012 - No start event exists in this operation activity network ?

  The SAP error message MPE_OAN012 indicates that there is no start event defined in the operation activity network for a particular operation. This error typically occurs in the context of project management or production planning when working with networks and activities in SAP.
  Cause:
  The error is usually caused by one of the following reasons:
  
  Missing Start Event: The operation activity network does not have a defined start event, which is necessary for the network to function correctly.
  Incorrect Configuration: The configuration of the operation or the network might be incorrect, leading to the absence of a start event.
  Data Entry Errors: There may be data entry errors in the network or operation setup that prevent the system from recognizing the start event.
  
  Solution:
  To resolve the error, you can take the following steps:
  
  
  Check the Network Configuration:
  
  Go to the network in question and verify that a start event is defined. You can do this by navigating to the network in the SAP GUI and checking the details of the operation activity network.
  
  
  
  Define a Start Event:
  
  If a start event is missing, you will need to create one. This can typically be done in the network maintenance screen by adding a start event to the operation.
  
  
  
  Review Dependencies:
  
  Ensure that all dependencies and relationships between activities are correctly defined. This includes checking predecessor and successor relationships.
  
  
  
  Validate Data:
  
  Check for any data entry errors in the operation or network setup. Ensure that all required fields are filled out correctly.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for specific instructions on how to set up operation activity networks and define start events.
  
  
  
  Use Transaction Codes:
  
  You can use transaction codes like CN21 (Create Network) or CN22 (Change Network) to manage networks and check for the presence of start events.
  
  
  
  Seek Help from SAP Support:
  
  If the issue persists after checking the above points, consider reaching out to SAP support or your internal SAP team for further assistance.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CN01 (Create Network), CN02 (Change Network), and CN03 (Display Network).
  SAP Notes: Check for any SAP Notes related to this error message for additional guidance or patches that may address the issue.
  Training and Documentation: Consider reviewing SAP training materials or documentation related to project systems and network planning for a deeper understanding of how to manage operation activity networks effectively.
  
  By following these steps, you should be able to identify and resolve the cause of the MPE_OAN012 error in your SAP system.