How To Fix RDM_BBY420 - Missing discount unit of measure on the Buy side

SAP Error Message - Details

• Message type: E = Error

• Message class: RDM_BBY - Bonus Buy: Messages

• Message number: 420

• Message text: Missing discount unit of measure on the Buy side

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RDM_BBY420 - Missing discount unit of measure on the Buy side ?

  The SAP error message RDM_BBY420, which indicates "Missing discount unit of measure on the Buy side," typically arises in the context of procurement and purchasing processes within SAP. This error is related to the configuration of discount conditions in purchasing documents, such as purchase orders or contracts.
  Cause:
  The error occurs when the system expects a discount unit of measure to be defined for a specific condition type in the purchasing document, but it is missing. This can happen due to several reasons:
  
  Configuration Issues: The discount condition type may not be properly configured in the system, leading to missing unit of measure settings.
  Master Data Issues: The material master or vendor master data may not have the necessary information regarding discount units of measure.
  Incomplete Condition Records: The condition records for discounts may not have been maintained correctly, lacking the required unit of measure.
  Document Type Settings: The document type used for the purchase order may not be set up to handle discounts appropriately.
  
  Solution:
  To resolve the RDM_BBY420 error, you can take the following steps:
  
  
  Check Condition Type Configuration:
  
  Go to the configuration settings for the relevant condition type in the SAP system (Transaction code: SPRO).
  Ensure that the discount condition type is correctly configured with the appropriate unit of measure.
  
  
  
  Review Master Data:
  
  Check the material master (Transaction code: MM03) and vendor master (Transaction code: XK03) to ensure that the necessary discount unit of measure is defined.
  If it is missing, update the master data accordingly.
  
  
  
  Maintain Condition Records:
  
  Use Transaction code: MEK1 to create or update condition records for the discount condition type.
  Ensure that the unit of measure is specified in the condition records.
  
  
  
  Document Type Settings:
  
  Verify the settings for the document type used in the purchase order (Transaction code: OME9).
  Ensure that it is configured to allow discounts and that the necessary fields are available.
  
  
  
  Testing:
  
  After making the necessary changes, create a new purchase order or update an existing one to see if the error persists.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific patches or updates related to this error message.
  Documentation: Review SAP documentation on condition types and pricing procedures for a deeper understanding of how discounts are managed in purchasing.
  User Forums: Engage with SAP community forums or user groups for additional insights and solutions from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify and resolve the cause of the RDM_BBY420 error in your SAP system.