Sql server 2008 &引用；获取在需要条件的上下文中指定的非布尔类型的表达式；我的查询有错误吗？

当我将此查询传递给执行动态sql的proc时，出现错误：

"select @display =  @display + gp2.ProblemDesc  + ''|' '
from (SELECT gp.GrantProblemID, gp.ProblemDesc, gps.GrantProblemStatus, row_number() over (partition by gp.grantproblemid order by p.periodid desc) ranking 
from MergedProgressReport.dbo.[PeriodAgencyGrantProblems] pagp    
inner join MergedProgressReport.dbo.PeriodAgencyGrants pag on pag.PeriodAgencyGrantsID = pagp.PeriodAgencyGrantID 
and pag.GrantNumber =  ''2011UMWX0001''   
inner join MergedProgressReport.dbo.periodagencyinfo pai on pag.PeriodAgencyInfoID = pai.PeriodAgencyInfoID   
inner join MergedProgressReport.dbo.Periods p on p.PeriodID = pai.PeriodID   
inner join MergedProgressReport.dbo.GrantProblemStatus gps on pagp.GrantProblemStatusID = gps.GrantProblemStatusID  
inner join MergedProgressReport.dbo.GrantProblems gp on pagp.GrantProblemID = gp.GrantProblemID 
and gp.GrantProblemAreaID = 7) xx right join MergedProgressReport.dbo.GrantProblems gp2 on xx.GrantProblemID = gp2.GrantProblemID and xx.ranking = 1 
where gp2.GrantProblemAreaID = 7 "

我的程序：

CREATE proc [dbo].[Review_Get_PrePopValue](@sqlQuery nvarchar(500), @display nvarchar(200) OUTPUT)
as

EXEC sp_executesql @sqlQuery,   
      N'@display varchar(200) output', 
      @display = @display output

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我的错误是，我的参数@sqlQuery nvarchar（500）太小了，它在我的程序中截断了我的sql语句。只是将其大小调整为3000