How To Fix MO459 - Left edge reached

SAP Error Message - Details

• Message type: E = Error

• Message class: MO - Modeling and Prototyping

• Message number: 459

• Message text: Left edge reached

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message MO459 - Left edge reached ?

  The SAP error message MO459 "Left edge reached" typically occurs in the context of production planning and scheduling, particularly when dealing with capacity planning or scheduling in the SAP system. This error indicates that the scheduling process has reached the earliest possible start time for a production order or operation, and there is no available capacity to schedule the operation before this time.
  Cause:
  
  Capacity Constraints: The work center or resource may not have available capacity to perform the operation at the required time.
  Scheduling Parameters: The scheduling parameters set for the production order may not allow for any flexibility, leading to the left edge being reached.
  Order Dependencies: There may be dependencies or constraints from preceding operations or orders that prevent scheduling.
  Calendar Settings: The factory calendar or work center calendar may not allow for operations to be scheduled at the desired times.
  
  Solution:
  
  Check Capacity: Review the capacity of the work center or resource to ensure that it can accommodate the operation. You may need to adjust the capacity or reschedule other orders.
  Adjust Scheduling Parameters: Modify the scheduling parameters for the production order to allow for more flexibility in scheduling. This may include changing lead times or float times.
  Review Order Dependencies: Ensure that all preceding operations or orders are completed and that there are no constraints preventing the scheduling of the current operation.
  Check Calendar Settings: Verify the factory calendar and work center calendar settings to ensure that they are configured correctly and that there are no holidays or non-working days affecting the scheduling.
  Reschedule the Order: If necessary, consider rescheduling the production order to a later date when capacity is available.
  
  Related Information:
  
  Transaction Codes: You can use transaction codes like CM01 (Capacity Planning) or CO02 (Change Production Order) to analyze and adjust the production orders and capacity.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Documentation: Refer to SAP documentation on production planning and scheduling for more detailed information on managing capacity and scheduling.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP support team or a functional consultant who specializes in production planning.