There are times where, as an example, both an audit partner or tax partner should be attributed a part of the invoice total for a client that belongs to another partner. Add the ability to make billing adjustments for a particular invoice and then reporting on the adjusted billing figures for that partners would solve this problem. All this would do is simply attribute a part of the bill. Debtor, actual invoicing and WIP reports would remain unchanged. You would prepare a separate report that shows the billing totals for a partner after the adjustment is applied.