How To Fix COSE028 - Scheduling sequence & operation &: Invalid combination of dates

SAP Error Message - Details

• Message type: E = Error

• Message class: COSE - Change Production Order

• Message number: 028

• Message text: Scheduling sequence & operation &: Invalid combination of dates

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message COSE028 - Scheduling sequence & operation &: Invalid combination of dates ?

  The SAP error message COSE028, which states "Scheduling sequence & operation &: Invalid combination of dates," typically occurs in the context of production planning and scheduling within the SAP system. This error indicates that there is an inconsistency or conflict in the dates associated with a scheduling sequence or operation in a production order or process order.
  Causes:
  
  Date Conflicts: The start and finish dates of operations or sequences may overlap or be set incorrectly, leading to an invalid scheduling scenario.
  Missing Dates: Required dates for operations or sequences may not be defined, causing the system to be unable to schedule them properly.
  Incorrect Dependencies: The dependencies between operations (e.g., predecessor/successor relationships) may not be set correctly, leading to scheduling conflicts.
  Capacity Constraints: If the resources (work centers) are not available during the specified dates, it can lead to scheduling issues.
  Calendar Settings: The factory calendar or work schedule may not align with the operation dates, causing conflicts.
  
  Solutions:
  
  Check Operation Dates: Review the start and finish dates of the operations in the scheduling sequence. Ensure that they are logically set and do not overlap incorrectly.
  Adjust Dependencies: Verify the predecessor and successor relationships between operations. Make sure that they are correctly defined and that the dates align with these relationships.
  Resource Availability: Check the availability of resources (work centers) during the specified dates. If resources are not available, adjust the scheduling accordingly.
  Review Factory Calendar: Ensure that the factory calendar is set up correctly and that it aligns with the operation dates. Adjust the calendar settings if necessary.
  Re-schedule the Order: If changes are made to the operations or resources, consider re-scheduling the production order to reflect the new settings.
  Use Transaction Codes: Utilize transaction codes like CO02 (Change Production Order) or CO03 (Display Production Order) to make necessary adjustments.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CO01 (Create Production Order), CO02 (Change Production Order), and CO03 (Display Production Order) for managing production orders.
  SAP Notes: Check SAP Notes for any known issues or patches related to scheduling errors. SAP Notes can provide additional insights or solutions for specific scenarios.
  Documentation: Review SAP documentation related to production planning and scheduling for best practices and guidelines on setting up operations and sequences correctly.
  
  If the issue persists after checking these areas, it may be beneficial to consult with your SAP support team or a functional consultant who specializes in production planning to further diagnose and resolve the issue.