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

MPE_OAN001 - Overview

• 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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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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MPE_OAN001 - Details

• 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