How To Fix WU420 - Please enter a material

SAP Error Message - Details

• Message type: E = Error

• Message class: WU - Promotion management messages

• Message number: 420

• Message text: Please enter a material

What causes this issue?

You entered a unit of measure but no material number.
&what_to_do&
Enter a material number or delete the unit of measure.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WU420 - Please enter a material ?

  The SAP error message WU420 ("Please enter a material") typically occurs in the context of material management or inventory management processes. This error indicates that the system requires a material number to proceed with a transaction, but none has been provided.
  Cause:
  
  Missing Material Number: The most common cause is that the user has not entered a material number in the relevant field.
  Incorrect Screen Navigation: The user may have navigated to a screen that requires a material number without first selecting or entering one.
  Configuration Issues: There may be configuration settings in the SAP system that require a material number for certain transactions, and these settings may not be properly aligned with user expectations.
  User Authorization: In some cases, the user may not have the necessary authorizations to view or select materials.
  
  Solution:
  
  Enter a Material Number: Ensure that you enter a valid material number in the required field. You can use the search function (often represented by a magnifying glass icon) to find the material if you do not know the number.
  Check Transaction Requirements: Review the transaction you are trying to perform to ensure that entering a material number is indeed required.
  Review User Authorizations: If you believe you should have access to certain materials, check with your SAP administrator to ensure you have the necessary authorizations.
  Consult Documentation: Refer to the relevant SAP documentation or user manuals for guidance on the specific transaction you are working with.
  Contact Support: If the issue persists, consider reaching out to your SAP support team for further assistance.
  
  Related Information:
  
  Transaction Codes: The error may occur in various transaction codes related to material management, such as MIGO (Goods Movement), MIRO (Invoice Verification), or others.
  Material Master Data: Ensure that the material master data is correctly set up in the system. You can check this using transaction code MM03 (Display Material).
  User Training: If this error is common among users, consider providing additional training on how to properly enter materials in the system.
  
  By following these steps, you should be able to resolve the WU420 error and proceed with your SAP transactions.