How To Fix WN064 - Priorities missing for period overlap

WN064 - Overview

• 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