# Application Notifications

Substation ES Application Notification provides information to applications regarding possible abnormal conditions, such as data transformation errors, possible Substation ES runtime failures and errors or failures that occur during the processing of applications requests.

An Application Notification consists of a status field and a nested or sub-message, or the fields are included as property fields of the user's message if the `EMS-USE-PROP` flag in the ESB SIP member is enabled. While communicating with Substation ES, if an abnormality occurs, the TIBCO messaging application receives an Application Notification. The application can log and trace abnormalities and possibly correct them.

Depending on the direction in which the failure of execution was detected, Substation ES sends back the information relayed by Application Notification to the TIBCO messaging application along with the application’s request or reply and error message.

An Application Notification is included in messages that are delivered to the publish and error subjects as defined in the recipe and trigger definition panel.

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