Of course it isn't allowed under the LAW 2007. But if I remember well, it was possible before this time [with all kind of restrictions for partner]. But my problem is where to find it in the Law. 25B says: A substituted call not permitted by A may be accepted by the offender’s LHO. (It is accepted if LHO calls intentionally over it.) The first call is then withdrawn, the second call stands and the auction continues. I cannot read the explanation as given by the EBU, etc. campboy gave me one argument: