How To Fix SWN155 - &1: Invalid Link (SWN155)

SAP Error Message - Details

• Message type: E = Error

• Message class: SWN - WF Notif: Messages

• Message number: 155

• Message text: &1: Invalid Link (SWN155)

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

What causes this issue?

You use the extended notifications for SAP Business Workflow to inform
users about new work items.
You send the notifications by e-mail. The e-mails contain links with the
following text and empty URLs:
<(><<)>Action>: Invalid link (SWN155)
<(><<)>Action> is a placeholder for the actions display work item,
execute work item, or call workflow inbox.
In the subscription (transaction SWNCONFIG or SWNADMIN) you define which
front-end application is to be used to display or execute the work items
and SAP Workflow inbox.
The configuration (task visualization) from transaction SWFVISU is also
applied. If a visualization type (for example, WebDynpro Java) is
configured for the relevant single-step tasks, this setting overrides
the setting from the subscription.
HTTP links or executable attachments are generated in the e-mail to
enable you to start the selected front-end application from within the
e-mail.
If generation is not possible because the configuration is incomplete,
an HTTP link with the text
'<(><<)>Action>: Invalid Link (SWN155)' and an empty URL are generated
instead.

System Response

How to fix this error?

Check the settings in the subscription on the basis of which the
notification was sent.
Check the settings in transaction SWFVISU for the single-step task on
which the work item is based.
Check in the general settings in transaction SWNCONFIG or SWNADMIN
whether the parameters WD_HOST and WG_HOST are set accordingly.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SWN155 - &1: Invalid Link (SWN155) ?

  The SAP error message SWN155, which states "Invalid Link (SWN155)," typically occurs in the context of the SAP Workflow Notification system. This error indicates that there is an issue with the link that is supposed to direct users to a specific workflow item or task.
  Causes of SWN155 Error
  
  
  Incorrect URL Configuration: The link generated for the workflow notification may be incorrect or malformed. This can happen if the system settings for the notification URLs are not properly configured.
  
  
  Missing or Inactive Workflow: The workflow that the link is trying to reference may not exist, may have been deleted, or may be inactive.
  
  
  Authorization Issues: The user may not have the necessary authorizations to access the workflow or the related transaction.
  
  
  System Configuration Issues: There may be issues with the configuration of the SAP system, such as missing parameters in the workflow configuration.
  
  
  Transport Issues: If the workflow was transported from one system to another, there may be inconsistencies or missing objects in the target system.
  
  
  Solutions for SWN155 Error
  
  
  Check Workflow Configuration:
  
  Verify that the workflow is correctly configured and active. You can do this by checking the workflow definition in transaction code SWDD (Workflow Builder).
  
  
  
  Review Notification Settings:
  
  Check the settings for the workflow notifications in transaction code SWN1 (Workflow Notification Settings). Ensure that the URLs are correctly defined.
  
  
  
  Test the Link:
  
  Manually test the link provided in the notification to see if it leads to the expected workflow item. If it does not, investigate the link structure.
  
  
  
  Check Authorizations:
  
  Ensure that the user has the necessary authorizations to access the workflow. You can check this in transaction code SU53 (Authorization Check) after attempting to access the link.
  
  
  
  System Logs:
  
  Review the system logs (transaction code SLG1) for any additional error messages or warnings that may provide more context about the issue.
  
  
  
  Transport Consistency:
  
  If the workflow was transported, ensure that all necessary objects were transported correctly. You may need to re-transport or adjust the configuration in the target system.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may address this specific error message or provide additional troubleshooting steps.
  
  
  
  Related Information
  
  
  Transaction Codes:
  
  SWDD: Workflow Builder
  SWN1: Workflow Notification Settings
  SU53: Authorization Check
  SLG1: Application Log
  
  
  
  SAP Documentation: Refer to the official SAP documentation for detailed information on workflow configuration and notification settings.
  
  
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered and resolved similar issues.
  
  
  By following these steps, you should be able to diagnose and resolve the SWN155 error in your SAP system.