What is a limitation of outbound messages in Salesforce?

The limitation of outbound messages in Salesforce lies in their inability to function with junction objects. Outbound messages are part of Salesforce workflow rules and are designed to send notifications or data to external systems when specific criteria are met. However, they are not directly supported for operations involving junction objects, which are used to create many-to-many relationships between two objects in Salesforce. This means that if you are trying to set up a workflow rule that includes a junction object, you won't be able to use an outbound message to send data or notifications associated with that relationship.

Understanding this limitation is crucial for integration architects, as they need to choose the right tools and methods for data communication based on the specific data models in use within a Salesforce environment.