vs2005 写的web servcies 在.net 2003下调用时报xml 604异常原因是因为实体类，声明类型两个环境不一样

实体类的类型不一样，例如，时间类型，数值类型，其定义实体时和vs2003还是有一定区别的

private System.Int32 trackingid;//检查意见答复id
private System.Int32? issueid;//检查意见id
private System.Int32? activityid;//检查活动id
private System.String type;//类型
private System.String checkcontent;//检查意见内容
private System.DateTime? checkdate;//检查意见日期
private System.String checkby;//检查人
private System.String checkdept;//检查部门
private System.DateTime? reviewdate;
private System.String reviewby;
private System.String reviewdept;
private System.DateTime? activitytime;
private System.String respondcontent;//答复内容
private System.String responser;//答复人
private System.DateTime? responddate;//答复日期
private System.String responserdept;//答复部门
private System.String creatorid;
private System.DateTime? createdate;
private System.String modifierid;
private System.DateTime? modifierdate;
private System.String reserved1;
private System.String reserved2;
将其？号去掉就可以调用了。