Project-centric organizations like ours budget project fees down to the activity level and have actual fee transactions down to the activity level as well.  The project WBS screen allows fees to be added to activities, but it doesn't currently go past the WBS.  Any project budget or actuals is without an activity reference.  To overcome this shortcoming... we have had to customize the system.  It seems that it would be minimal effort to extend activities to fee transactions.  Any project-based professional services organization would appreciate this added detail for sure. 
Under Review
Ideas Administrator

Thank you for your feedback. Currently this is not in our roadmap; however, we are tracking it and if we get more feedback and votes, we may consider it in the future.

Sincerely, Annette Bruer, PM, Microsoft