Offshore finance in Ghana: Why not?

I was somewhat surprised by a newspaper headline in January 2010. 'Tax haven risks corruption, OECD warns Ghana (Mathiason 2010). As a researcher on off-shore financial centres (OFCs), also known as tax havens, for a number of years this attribution to Ghana, as a tax haven, appeared at first glance as somewhat exceptional. There are a number of list identifying either tax havens or OFCs but none include Ghana (see OECD 2000, p. 17, Tax Justice Network 2007, Zoromé 2007, p. 19, Palan et al.2010, pp. 41-44). Consequently, a question took root in my mind: why was the Organisation for Economic Co-operation and Development (OECD), paragon of developed-state virtue, chastising Ghana? Since my initial encounter with this headline, I have pursued an answer to this question, only to arrive at the title question to this intervention. In the following discussion, I seek to assess the grounds for the OECD statement, and then to counter it with my own question: why not?