How To Fix /IWFND/CM_MGW151 - Notification Sending failed; Subscribed collection does not exist

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/CM_MGW -

• Message number: 151

• Message text: Notification Sending failed; Subscribed collection does not exist

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 /IWFND/CM_MGW151 - Notification Sending failed; Subscribed collection does not exist ?

  The SAP error message /IWFND/CM_MGW151 Notification Sending failed; Subscribed collection does not exist typically occurs in the context of SAP Gateway and OData services when there is an issue with the notification mechanism for subscribed collections. This error indicates that the system is unable to send notifications because the specified subscribed collection does not exist or is not properly configured.
  Causes:
  
  Non-existent Subscription: The subscription that the notification is trying to send to does not exist in the system.
  Incorrect Configuration: The configuration for the OData service or the notification settings may be incorrect or incomplete.
  Service Activation: The OData service may not be activated or properly registered in the SAP Gateway.
  Authorization Issues: There may be authorization issues preventing access to the subscribed collection.
  Data Model Changes: Changes in the underlying data model or service definition that affect the subscription.
  
  Solutions:
  
  Check Subscription: Verify that the subscription exists in the system. You can check this in the SAP Gateway client or through the relevant transaction codes (e.g., /IWFND/MAINT_SERVICE).
  Review Configuration: Ensure that the OData service is correctly configured and that all necessary parameters are set up properly.
  Activate Service: If the OData service is not activated, activate it using transaction code /IWFND/MAINT_SERVICE.
  Check Authorization: Ensure that the user has the necessary authorizations to access the subscribed collection.
  Debugging: If the issue persists, consider debugging the OData service to identify where the failure occurs. You can use transaction code /IWFND/DEBUG to enable debugging for OData services.
  Check Logs: Review the application logs (transaction code SLG1) for any additional error messages or warnings that may provide more context about the issue.
  Recreate Subscription: If the subscription is corrupted or not functioning, consider deleting and recreating the subscription.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to the specific error message for any known issues or patches.
  Documentation: Refer to the official SAP documentation for OData services and SAP Gateway for best practices and troubleshooting steps.
  Community Forums: Engage with the SAP Community or forums for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to diagnose and resolve the error related to the notification sending failure in SAP Gateway.