How To Fix SWN028 - User &1: Unable to determine telephone number

SAP Error Message - Details

• Message type: E = Error

• Message class: SWN - WF Notif: Messages

• Message number: 028

• Message text: User &1: Unable to determine telephone number

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SWN028 - User &1: Unable to determine telephone number ?

  The SAP error message SWN028 ("User &1: Unable to determine telephone number") typically occurs in the context of the SAP Business Workflow or SAP Business Communication Services when the system is unable to retrieve the telephone number of a user specified in the workflow or communication settings. This can hinder notifications or alerts that are supposed to be sent to the user via telephone.
  Cause:
  
  Missing User Data: The user profile may not have a telephone number assigned in the user master data.
  Incorrect User ID: The user ID specified in the error message may be incorrect or not exist in the system.
  Authorization Issues: The user or the system may not have the necessary authorizations to access the user data.
  Configuration Issues: There may be issues with the configuration of the communication settings in the SAP system.
  
  Solution:
  
  
  Check User Master Data:
  
  Go to transaction code SU01 (User Maintenance).
  Enter the user ID mentioned in the error message and check the "Address" tab.
  Ensure that a valid telephone number is entered in the relevant fields.
  
  
  
  Verify User ID:
  
  Confirm that the user ID is correct and exists in the system.
  If the user ID is incorrect, update the workflow or communication settings with the correct user ID.
  
  
  
  Review Authorizations:
  
  Ensure that the user has the necessary authorizations to access their own user data.
  Check the roles and profiles assigned to the user to ensure they have the required permissions.
  
  
  
  Check Communication Configuration:
  
  Review the configuration settings for the SAP Business Workflow or communication services.
  Ensure that the settings are correctly configured to retrieve user contact information.
  
  
  
  Testing:
  
  After making the necessary changes, test the workflow or communication process again to see if the error persists.
  
  
  
  Related Information:
  
  Transaction Codes: 
  
  SU01 for User Maintenance
  SWU3 for Workflow Customizing
  
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Documentation: Refer to SAP Help documentation for more details on user management and workflow configuration.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP Basis or technical team for further investigation.