Draw down UER at the task level

 We have a requirement to draw down Deferred Revenue events by task rather than at the project level. I considered using an AA rule to determine if the task_id's on the expenditure item and the deferred revenue event match, but this would not take into consideration how much deferred revenue remains to determine if the offset should be UER or UBR. Is there a way to accomplish this, maybe through Subledger Accounting?