"Not all what a CPA is permitted to do
but nothing what he may not."

Given my professional experience (but governed also by my location), this will mainly involve honorary projects or direct advice to the CFO or CEO on topics such as Value based Management, Pre and Post Merger Integration, Reshaping Strategies, Consultancy Selection or perhaps just a good business discussion. As you know, German CPA's are bound by oath and by law to exercise professional discretion.