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Applies to: 
SQL Server
Azure SQL Managed Instance
Two general principles apply when handling Transact-SQL errors in a Service Broker application.
First, an application shouldn't permanently remove a message from a queue without acting upon the message. In most cases, this means that an application should always receive a message within a transaction.
Second, an application should always hold a lock on a conversation group before updating the state of the conversation group or the state of any message in the conversation group. When an application receives a message within a transaction, the application automatically locks the conversation group.