WAS 6.30, Netweaver 2.0 - AbstractProxyBean not found

Hi

We are trying to create Java Bean classes for BAPIs. The class gets created but the bean and the remote interface cannot be compiled because

public class BAPI1_PortTypeBean extends com.sap.aii.proxy.framework.core.AbstractProxyBean {

Error: "cannot be resolved or is not a valid superinterface"

public class BAPI1_PortTypeBean extends com.sap.aii.proxy.framework.core.AbstractProxyRemote {

Error: "cannot be resolved or is not a valid superclass"

I could not find these in any jar file. Where are these supposed to be?

Also, is it safe to assume that Java Bean means Enterprise Java Bean? I mean, can we expose these as web services if we need to?

Thanks a lot in advance,