This should let you instanciate a BOReader at the customization level. Just import the BOReader LIB.dll from the client
Ice.Proxy.Lib.BOReaderImpl _bor = WCFServiceSupport.CreateImpl<Ice.Proxy.Lib.BOReaderImpl>((Ice.Core.Session)oTrans.Session, Epicor.ServiceModel.Channels.ImplBase<Ice.Contracts.BOReaderSvcContract>.UriPath);
DataSet ds = _bor.GetList("Erp:BO:UOMSearch","","UOMCode");