How To Fix CY891 - Operation moved because of a fixed time period

SAP Error Message - Details

• Message type: E = Error

• Message class: CY - Capacity Requirements Planning

• Message number: 891

• Message text: Operation moved because of a fixed time period

System Response

The original dispatching date of the operation is such that the
execution time of the operation clashes with the fixed time period. You
cannot dispatch operations into the fixed time period.
Thus the operations was dispatched to another date.

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 CY891 - Operation moved because of a fixed time period ?

  The SAP error message CY891, which states "Operation moved because of a fixed time period," typically occurs in the context of production planning and scheduling within the SAP system. This error indicates that an operation in a production order or a project has been rescheduled due to a fixed time constraint that has been defined in the system.
  Cause:
  
  
  Fixed Time Period: The operation has a fixed time period associated with it, which may be defined in the routing or the production order. This fixed time period can be due to various reasons, such as:
  
  Setup times that cannot be changed.
  Dependencies on other operations or resources.
  Constraints related to the availability of materials or resources.
  
  
  
  Scheduling Conflicts: The scheduling engine in SAP may have found that the operation cannot be executed within the originally planned timeframe due to the fixed time constraints, leading to the operation being moved to a later date.
  
  
  Resource Availability: If the resources (machines, labor, etc.) required for the operation are not available during the planned time, the system may automatically reschedule the operation.
  
  
  Solution:
  
  
  Review Fixed Time Settings: Check the routing and production order for any fixed time settings that may be causing the issue. You may need to adjust these settings if they are too restrictive.
  
  
  Check Resource Availability: Ensure that the resources required for the operation are available during the planned time. If not, consider rescheduling the operation or reallocating resources.
  
  
  Adjust Scheduling Parameters: If the fixed time periods are necessary, you may need to adjust other scheduling parameters to allow for more flexibility in the scheduling process.
  
  
  Manual Rescheduling: If the automatic scheduling does not meet your requirements, you can manually reschedule the operation to a more suitable time.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for specific details on how to manage fixed time periods and scheduling in your version of SAP.
  
  
  Related Information:
  
  Transaction Codes: You may use transaction codes like CO02 (Change Production Order) or C223 (Change Routing) to review and modify the relevant settings.
  SAP Notes: Check for any SAP Notes related to this error message for additional insights or patches that may address the issue.
  User Exits and BAdIs: If you have custom logic in your SAP system, review any user exits or BAdIs that may affect scheduling behavior.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP support team or a consultant who specializes in SAP production planning and scheduling.