How To Fix MPE_INSTALLATION_MSG064 - Network activity &1 starts before predecessor &2 starts

SAP Error Message - Details

• Message type: E = Error

• Message class: MPE_INSTALLATION_MSG -

• Message number: 064

• Message text: Network activity &1 starts before predecessor &2 starts

What causes this issue?

Two network activities are connected by a precedence relationship and a
start-start relationship. However, the predecessor activity starts after
the successor activity starts.

System Response

The system does not automatically reschedule network activities

How to fix this error?

Reschedule the network activities (using transaction <AB>CJ20N</>) to
make the schedule feasible.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MPE_INSTALLATION_MSG064 - Network activity &1 starts before predecessor &2 starts ?

  The SAP error message MPE_INSTALLATION_MSG064 indicates that there is a network activity that is starting before its predecessor activity has been completed. This typically occurs in the context of project management or process scheduling within SAP, where activities are interdependent and must follow a specific sequence.
  Cause:
  The error arises when:
  
  A network activity (e.g., a task or process) is scheduled to start before its predecessor activity has finished.
  There may be a misconfiguration in the scheduling of activities, such as incorrect start and finish dates or dependencies not being properly defined.
  The project or process plan may have been altered, leading to conflicts in the sequence of activities.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Activity Dependencies:
  
  Review the dependencies between the activities in your project or process. Ensure that the predecessor activity is correctly defined and that the successor activity is set to start only after the predecessor has completed.
  
  
  
  Adjust Scheduling:
  
  Modify the start and finish dates of the activities involved. Ensure that the successor activity is scheduled to start after the predecessor activity has finished.
  
  
  
  Review Network Diagram:
  
  If you are using a network diagram, visually inspect the flow of activities to ensure that all dependencies are correctly represented.
  
  
  
  Recalculate Dates:
  
  If you have made changes to the activities, recalculate the dates to ensure that the scheduling reflects the correct sequence.
  
  
  
  Check for Constraints:
  
  Look for any constraints that may be affecting the scheduling of activities. Remove or adjust any constraints that are causing conflicts.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for specific guidance on managing network activities and dependencies.
  
  
  
  Related Information:
  
  SAP Modules: This error is commonly encountered in modules related to Project System (PS), Production Planning (PP), or any other module that involves network planning.
  Transaction Codes: You may need to use transaction codes like CJ20N (Project Builder) or CNO1 (Network Overview) to view and edit the activities.
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide additional guidance on handling this error.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to ensure that your network activities are scheduled correctly.