# Structure

If a user application must receive notifications, you must specify the appropriate Reply Method for the recipe or trigger definition. The communication field tibss-status validates the delivery of notifications.

If an application receives a tibss-status field and the contents are nonzero, the user’s message receives an associated nested error message with the error information. When the ESB interface parameter EMS-USE-PROP is set to Y, or if the message is a BYTES or TEXT message, the nested error message fields are sent as properties fields.

The format of the notification is as follows:

- Notification Control Fields within the user’s received message.
- Notification Message Fields within a nested message.

The following figures illustrate the structures of those fields.
Structure of Application Notification Message
Nested Structure of Substation ES Error Message
Structure of Substation ES Error Messages as Properties Fields
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