When configuring the Max # of retries for the queue in Orchestrator to "1" for...

A Business Rule Exception is a type of exception that indicates that the data or the input required for the automation process is incomplete or invalid1. For example, a Business Rule Exception can occur when a phone number is missing a digit, or when a mandatory field is left blank1. A Business Rule Exception is usually thrown by the developer using the Throw activity, and it is handled by the Set Transaction Status activity, which sets the status of the transaction item to Failed and adds the exception details to the queue item2. By default, Orchestrator does not retry transactions that are failed due to Business Rule Exceptions, regardless of the Max # of retries setting for the queue3. This is because retrying the transaction does not solve the issue, and there are other better courses of action, such as notifying the human user of the error1. Therefore, if the first transaction item throws a Business Rule Exception, the transaction is not retried, but the remaining transactions continue processing, as long as they do not encounter any other exceptions.