Sql 必须在存储过程中将标量变量“@bit”声明为输出参数

我有这个程序，但当它工作正常时，没有设置输出参数@bit的两个if。当我尝试执行proc p3时，出现以下错误

必须声明标量变量@bit

这是密码

create proc p3 @codP int, @codM int, @dela datetime, @panala datetime, @pret smallint, @bit bit output
as
begin
    declare @val smallint
    set @val = (select COUNT(*)
                from OferteSpeciale as OS
                where OS.codP = @codP and OS.codM = @codM and 
                        ((@panala >= OS.dela and @panala <= OS.panala)
                        or (@dela >= OS.dela and @dela <= OS.panala) or
                        (@dela <= OS.dela and @panala >= OS.panala)))
    print @val
    if (@val = 0)
        begin
            insert into OferteSpeciale (codP,codM,dela,panala,pret) values (@codP,@codM,@dela,@panala,@pret)
            declare @others smallint
            set @others = (select COUNT(*)
                         from Cataloage as c, OferteSpeciale as os
                         where ((c.codM = @codM and c.codP = @codP and c.pret < @pret) or
                            (os.codM = @codM and os.codP = @codP and os.pret < @pret)))
            if (@others > 0)
              set @bit = 0
            else
              set @bit = 1
        end
    else
      RAISERROR 50001 'There is already a special offer for that product, in that shop, between that dates'
end
declare @bit bit
exec p3 1, 3, '2013-04-15', '2013-04-15', 25, @bit output

---

作为一个简单的回答，在声明存储过程之后，您错过了一个GO，如果我尝试按照您提供的方式运行它，那么如果我添加GO以将声明从执行中分离，就会出现另一个错误

end
GO
declare @bit bit
exec p3 1, 3, '2013-04-15', '2013-04-15', 25, @bit output

---

显然，我必须删除存储过程的内容，因为我的数据库中没有这些对象，但问题似乎围绕@Bit

edited:，很抱歉，这是一个问题错误