过程参数默认值的问题

CREATE   procedure   gh_query(
@gh1   varchar(200)= '% ',@gh2   varchar(200)= '% ')
AS
set   nocount   on


CREATE   TABLE   [dbo].[ghtemp]   (
[ID]   [int]   IDENTITY   (1,   1)   NOT   NULL   ,
[FID]   [int]   NULL   ,
[finterid]   [int]   NOT   NULL   ,
[客户名称   (Client)]   [varchar]   (80)   COLLATE   Chinese_PRC_CI_AS   NULL   ,
[发票号码       (Inv.   No)]   [nvarchar]   (255)   COLLATE   Chinese_PRC_CI_AS   NOT   NULL   ,
[发票日期     (Inv.   Date)]   [datetime]   NULL   ,
[     货物净值         (Net   value)]   [decimal](38,   4)   NULL   ,
[税   额   (VAT)]   [decimal](38,   4)   NULL   ,
[       运         费             (Transport   cost)]   [varchar]   (255)   COLLATE   Chinese_PRC_CI_AS   NULL   ,
[   价税合计         (Total   Amount)]   [decimal](38,   10)   NULL   ,
[应回款日   (Due   date)]   [varchar]   (255)   COLLATE   Chinese_PRC_CI_AS   NULL   ,
[实际回款金额       (Amount   cashed)]   [money]   NULL   ,
[实际回款日期   (Date   of   cash)]   [datetime]   NULL  
)   ON   [PRIMARY]
--GO

insert   ghtemp   (
[FID]     ,
[finterid]   ,
[客户名称   (Client)]   ,
[发票号码       (Inv.   No)]     ,
[发票日期     (Inv.   Date)]     ,
[     货物净值         (Net   value)]     ,
[税   额   (VAT)]   ,
[       运         费             (Transport   cost)]     ,
[   价税合计         (Total   Amount)]   ,
[应回款日   (Due   date)]   ,
[实际回款金额       (Amount   cashed)]   ,
[实际回款日期   (Date   of   cash)]  
)  


select  
D.FID   AS   FID,
A.finterid   AS   finterid,
C.Fname   as   [客户名称   (Client)],
A.Fbillno   as   [发票号码       (Inv.   No)],  
A.Fdate   as   [发票日期     (Inv.   Date)],
Sum(B.FAmount)   AS   [     货物净值         (Net   value)],  
Sum(B.FTaxAmount)   AS   [税   额   (VAT)],
A.FHeadselfi0453   as   [       运         费             (Transport   cost)],
sum(B.FAmountincludetax)   as   [   价税合计         (Total   Amount)],
A.FHeadselfi0464   as   [应回款日   (Due   date)],
D.FcheckamountFor     as   [实际回款金额       (Amount   cashed)]   ,
D.fcheckdate   as   [实际回款日期   (Date   of   cash)]

from  
ICsale   A
JOIN  
ICsaleentry   B
on     A.finterid   =B.finterid  
JOIN  
t_Organization   C
on     A.FcustID