How To Fix WRF_REF420 - Inheritance excludes parallel processing!

SAP Error Message - Details

• Message type: E = Error

• Message class: WRF_REF - Messages from References for Materials Without History

• Message number: 420

• Message text: Inheritance excludes parallel processing!

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WRF_REF420 - Inheritance excludes parallel processing! ?

  The SAP error message WRF_REF420 ("Inheritance excludes parallel processing") typically occurs in the context of SAP's Advanced Planning and Optimization (APO) module, particularly when dealing with the inheritance of characteristics in planning scenarios. This error indicates that there is a conflict between the settings for parallel processing and the inheritance of certain characteristics.
  Cause:
  The error arises when you attempt to execute a planning run that involves characteristics that are set to be inherited, but the system is configured to use parallel processing. Inheritance in this context means that certain characteristics or values are derived from a higher level in the hierarchy, and this process cannot be executed in parallel due to the dependencies involved.
  Solution:
  To resolve the WRF_REF420 error, you can consider the following approaches:
  
  
  Disable Parallel Processing:
  
  If the planning run does not require parallel processing, you can disable it. This can usually be done in the planning run settings or job configuration.
  Navigate to the relevant transaction (e.g., /SAPAPO/MC90 for planning runs) and adjust the settings to disable parallel processing.
  
  
  
  Review Characteristic Settings:
  
  Check the characteristics involved in the planning run. Ensure that the settings for inheritance are correctly configured and that they do not conflict with parallel processing.
  You may need to adjust the configuration of the characteristics in the master data or planning area.
  
  
  
  Adjust Planning Area Settings:
  
  Review the settings of the planning area to ensure that it is configured to support the desired processing method. This may involve checking the settings for the planning area in transaction /SAPAPO/MP30.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to the specific version of APO you are using. There may be specific recommendations or patches available that address this issue.
  
  
  
  Contact SAP Support:
  
  If the issue persists after trying the above solutions, consider reaching out to SAP support for further assistance. They may provide insights based on the specific configuration and version of your system.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional context.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as /SAPAPO/MC90 for planning runs, /SAPAPO/MP30 for planning area settings, and others that may be pertinent to your configuration.
  Documentation: Review the SAP Help Portal for detailed documentation on APO and planning processes, which may provide additional insights into handling characteristics and parallel processing.
  
  By following these steps, you should be able to resolve the WRF_REF420 error and successfully execute your planning runs.