AXAPTA - Web service "CLR object cannot be marshaled to Microsoft Dynamics anytype." error

SenderTel2      = line.get_senderTel2();

If you get "CLR object cannot be marshaled to Microsoft Dynamics anytype." error message when reading value from any services property when value is null and can't hide this error even use try/catch, you have to do:

SenderTel2      = CLRInterop::isNull(line.get_senderTel2()) ? "" : line.get_senderTel2();