How To Fix CY766 - Order & Operation &: Displayed dates of operation cannot be changed

SAP Error Message - Details

• Message type: E = Error

• Message class: CY - Capacity Requirements Planning

• Message number: 766

• Message text: Order & Operation &: Displayed dates of operation cannot be changed

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CY766 - Order & Operation &: Displayed dates of operation cannot be changed ?

  The SAP error message CY766 ("Order & Operation &: Displayed dates of operation cannot be changed") typically occurs in the context of production orders or operations within the SAP system, particularly when working with capacity planning or scheduling.
  Cause:
  This error message is usually triggered when you attempt to change the dates of an operation in a production order that is not allowed due to the following reasons:
  
  Status of the Order: The production order may be in a status that does not allow changes (e.g., "TECO" - Technically Completed, "CLSD" - Closed).
  Dependencies: There may be dependencies or constraints that prevent the modification of dates, such as linked operations or resource availability.
  Scheduling Parameters: The scheduling parameters set for the operation may restrict changes to the dates.
  Locked by Other Processes: The operation might be locked by another user or process, preventing changes.
  
  Solution:
  To resolve the CY766 error, you can take the following steps:
  
  
  Check Order Status: Verify the status of the production order. If it is in a status that does not allow changes (like TECO or CLSD), you will need to revert it to a status that allows changes (e.g., "Released").
  
  
  Review Dependencies: Check if there are any dependencies or constraints that are preventing the date changes. This may involve reviewing linked operations or resources.
  
  
  Adjust Scheduling Parameters: If the scheduling parameters are too restrictive, consider adjusting them to allow for date changes.
  
  
  Unlock the Operation: If the operation is locked by another user or process, you may need to wait for the lock to be released or contact the user who has the lock.
  
  
  Use Transaction Codes: Use transaction codes like CO02 (Change Production Order) to attempt to make the necessary changes. Ensure you have the appropriate authorizations to make these changes.
  
  
  Consult Documentation: Review SAP documentation or consult with your SAP support team for specific configurations or settings that may be affecting the ability to change operation dates.
  
  
  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).
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  User Authorizations: Ensure that you have the necessary authorizations to make changes to production orders and operations.
  Training and Documentation: Consider training sessions or documentation on production order management and scheduling in SAP to better understand the constraints and functionalities.
  
  If the issue persists after trying the above solutions, it may be beneficial to reach out to your SAP support team for further assistance.