I think what is happening is that the oecd table includes social contributions as budgetary  revenue and social benefits as budgetary costs - while the Greek government tables exclude the costs and the benefits from their calculations in the main table - possibly because government has no direct control of these revenues, and theoretically simply "guarranties" most of the social benefit costs. The IMF then counts all social benefits as part of the wage bill, which is quite a trick IMHO. Hah, talking about cooking up numbers...

The road of excess leads to the palace of wisdom - William Blake