How To Fix WN064 - Priorities missing for period overlap

SAP Error Message - Details

• Message type: E = Error

• Message class: WN - Plant master data maintenance (integrated)

• Message number: 064

• Message text: Priorities missing for period overlap

What causes this issue?

At least two supplying plants are valid during the period.

System Response

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

How to fix this error?

Enter priorities for all supplying plants.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WN064 - Priorities missing for period overlap ?

  The SAP error message WN064 "Priorities missing for period overlap" typically occurs in the context of work scheduling or capacity planning within the SAP system, particularly in the Production Planning (PP) or Plant Maintenance (PM) modules. This error indicates that there is a conflict in the scheduling of tasks or resources due to overlapping periods without defined priorities.
  Cause:
  
  Overlapping Time Periods: The error arises when there are multiple tasks or orders scheduled for the same time period, but the system cannot determine which task should take precedence due to missing priority settings.
  Missing Priority Settings: The priority settings for the relevant work centers or resources may not be defined, leading to ambiguity in scheduling.
  Configuration Issues: There may be issues in the configuration of the work center or the scheduling parameters that prevent the system from resolving the overlap.
  
  Solution:
  
  Define Priorities: Ensure that priorities are defined for the relevant work centers or resources. This can typically be done in the configuration settings of the work center or through the relevant transaction codes (e.g., CR01 for creating work centers).
  Check Scheduling Parameters: Review the scheduling parameters for the orders or tasks that are overlapping. Make sure that they are set correctly and that there are no conflicts.
  Adjust Task Scheduling: If possible, adjust the scheduling of the tasks or orders to eliminate the overlap. This may involve rescheduling one of the tasks to a different time period.
  Review Capacity Planning: Check the capacity planning settings to ensure that they are correctly configured to handle overlapping tasks. This may involve adjusting the capacity of work centers or resources.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on handling scheduling conflicts and setting priorities.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CR01 (Create Work Center), CR02 (Change Work Center), and CM01 (Capacity Planning).
  SAP Notes: Check for any SAP Notes related to this error message, as they may provide additional insights or patches that address the issue.
  User Forums: Engage with SAP user forums or communities where similar issues may have been discussed, and solutions shared.
  
  By addressing the underlying causes of the error and ensuring that priorities are properly defined, you should be able to resolve the WN064 error and proceed with your scheduling tasks in SAP.