Status for a service broker queue
The original design called for separate enqueue_enabled (allow SEND) and dequeue_enabled (allow RECEIVE). The added complexity (as SSB wouldn't already be complex enough!) did not warrant the benefits, so in the end it was settled for a less granular 'queue enabled'. The metadata though was intentionally left split in order to enable the separation in future. Now, even if there is no plan to split the enable/disable in SEND/RECEIVE, the view has to stay like that because of back compat issues.

From your point of view: the two values should always be in sync (both 0 or both 1). Altering the enabled/disabled status on the queue should change both values at once.