nvarchar limits to 8000 characters within stored procedure
<p>I have a problem with  my stored procedure :</p>

<pre><code>  ALTER PROCEDURE [dbo].[Sp_Calculate_TimeSheet_Global_Info]
        @DateDebut date,
        @DateFin date,
        @UserId int,
        @CA varchar(10)    
    AS


    BEGIN

       DECLARE @TaskQuery nvarchar(MAX) ;
       DECLARE @OPENQUERY nvarchar(MAX),@TSQL nvarchar(MAX), @LinkedServer nvarchar(MAX);
      DECLARE @DateDebut1 date;
      DECLARE @DateFin1 date;
      DECLARE @UserId1 int; 
      DECLARE @Query nvarchar(MAX);

       DECLARE @cond1 nvarchar(MAX);
       DECLARE @cond2 nvarchar(MAX);
       DECLARE @cond3 nvarchar(MAX);
       DECLARE @cond4 nvarchar(MAX);
       DECLARE @cond5 nvarchar(MAX);
       DECLARE @cond6 nvarchar(MAX);
       DECLARE @cond7 nvarchar(MAX);
       DECLARE @cond8 nvarchar(MAX);
       DECLARE @cond9 nvarchar(MAX);
       DECLARE @cond10 nvarchar(MAX);
       DECLARE @cond11 nvarchar(MAX);
       DECLARE @cond12 nvarchar(MAX);
       DECLARE @cond13 nvarchar(MAX);

       DECLARE @op nvarchar(MAX);
       DECLARE @where nvarchar(MAX);
       DECLARE @exec nvarchar(MAX);

       SET NOCOUNT ON;

     SET @LinkedServer = 'TASK'
     SET @OPENQUERY = 'SELECT * FROM OPENQUERY('+ @LinkedServer + ','''
     SET @DateDebut1 = @DateDebut;
     SET @DateFin1 = @DateFin;
     SET @UserId1 = @UserId;

     set @op = ' UNION ';
     set @where = ' where 1=1 ';

     set @cond1 = ' LEFT OUTER JOIN tickets tkt ON tkt.ttick_id = h.ttick_id  ';
     set @cond2 = ' RIGHT OUTER JOIN tickets tkt ON tkt.ttick_id = h.ttick_id  ';
     set @cond3 = ' LEFT OUTER JOIN ptasks tsk ON h.ptask_id = tsk.ptask_id  ';
     set @cond4 = ' RIGHT OUTER JOIN tasks tsk ON h.ptask_id = tsk.ptask_id  ';
     set @cond5 = ' LEFT OUTER JOIN phases ph ON tsk.phase_id = ph.phase_id  ';
     set @cond6 = ' RIGHT OUTER JOIN tasks tsk ON h.ptask_id = tsk.ptask_id  ';
     set @cond7 = ' LEFT OUTER JOIN projects p ON ph.proj_id = p.proj_id  ';
     set @cond8 = ' RIGHT OUTER JOIN projects p ON ph.proj_id = p.proj_id  ';
     set @cond9 = ' and h.hours_spent &gt;= str_to_date(''''' + convert(varchar,@DateDebut,103) + ''''', ''''%d/%m/%Y'''')';
     set @cond10 = ' and h.hours_spent &lt;= str_to_date(''''' + convert(varchar,@DateFin,103) + ''''', ''''%d/%m/%Y'''')';
     set @cond11 = ' and h.user_id=' + cast(@UserId as varchar);
     set @cond12 = ' and 
                       ( ph.phase_name like ''''' + '%' + @CA +'%' +''''' and (p.proj_name not like ''''' + '%' + @CA +'%' +''''' or p.proj_name is null) ) or
                       ( (ph.phase_name not like ''''' + '%' + @CA +'%' +''''' or ph.phase_name is null) and (p.proj_name not like ''''' + '%' + @CA +'%' +''''' or p.proj_name is null) and tsk.ptask_name like ''''' + '%' + @CA +'%' +''''') or
                       ( (ph.phase_name not like ''''' + '%' + @CA +'%' +''''' or ph.phase_name is null) and (p.proj_name not like ''''' + '%' + @CA +'%' +''''' or p.proj_name is null) and (tsk.ptask_name not like ''''' + '%' + @CA +'%' +''''' or tsk.ptask_name is null) and tkt.ttick_name like ''''' + '%' + @CA +'%' +''''') or
                       ( (p.proj_name not like ''''' + '%' + @CA +'%' +''''' or p.proj_name is null) and tsk.ptask_name like ''''' + '%' + @CA +'%' +''''' and (tsk.phase_id is null or tsk.phase_id =-1) ) or
                       ( (p.proj_name not like ''''' + '%' + @CA +'%' +''''' or p.proj_name is null) and tkt.ttick_name like ''''' + '%' + @CA +'%' +''''')
                        ';
     set @cond13 = ''') src';




      SET @TaskQuery  =N' SELECT  h.hours_id , h.hours_spent as  TimeSheet_Date, h.hours_hours as Hour_Number,h.hours_note as Hour_Note,(case when h.ttick_id is null or h.ttick_id=-1 then tsk.ptask_name else tkt.ttick_name end) as Task_Ticket_Libelle,(case when h.ttick_id is null or h.ttick_id=-1 then h.ptask_id else h.ttick_id end) as Task_Ticket_Id,h.proj_id as Project_Id,(case when h.ttick_id is null or h.ttick_id=-1 then 1 else 0 end) as Is_Task,h.user_id as User_Id,p.proj_name as Project_Name, u.user_uname as User_Name from users u RIGHT OUTER JOIN user_hours h  on u.user_id=h.user_id ' ;



      SET  @Query = @TaskQuery  ;

      SET @TaskQuery = @Query+   @cond1  ;

      SET @TaskQuery = @TaskQuery + @op +  @Query + @cond2    ;


      SET  @Query =  @TaskQuery  ;
      SET @TaskQuery = @Query + @cond3   ;
      SET @TaskQuery =@TaskQuery + @op +  @Query + @cond4    ;


      SET  @Query = @TaskLandQuery ;
      SET @TaskQuery = @Query + @cond5   ;
      SET @TaskQuery =@TaskQuery + @op +  @Query + @cond6    ;



      SET  @Query = @TaskQuery ;
      SET @TaskQuery = @Query + @cond7   ;
      SET @TaskQuery =@TaskQuery + @op +  @Query + @cond8    ;

      SET @TaskQuery = @TaskQuery + @where   ;



    IF(@DateDebut is not null)
    BEGIN 
       SET @TaskQuery = @TaskQuery + @cond9 ;
    END

    IF(@DateFin is not null)
    BEGIN 
       SET @TaskQuery =@TaskQuery + @cond10   ;
    END


    IF(@UserId is not null)
    BEGIN 
       SET @TaskQuery =  @TaskQuery +  @cond11   ;
    END

    IF(@CA is not null)
    BEGIN 
       SET @TaskQuery =  @TaskQuery + @cond12   ; 
    END

    set @TaskQuery = @TaskQuery + @cond13    ; 


      set @exec = @OPENQUERY+@TaskQuery;




    delete  from [dbo].[Timesheet_Global_Info]; 

    insert into [dbo].[Timesheet_Global_Info](
                [hours_id]
               ,[TimeSheet_Date]
               ,[Hour_Number]
               ,[Hour_Note]
               ,[Task_Ticket_Libelle]
               ,[Task_Ticket_Id]
               ,[Project_Id]
               ,[Is_Task]
               ,[User_Id]
               ,[Project_Name]
               ,[User_Name] 
               )

         EXEC (@exec) ; 

END
</code></pre>

<p>When I execute this procedure, I get this error:</p>

<blockquote>
  <p>Msg 103, Level 15, State 1, Line 3
  The string that starts with SELECT h.hours_id, h.hours_spent have TimeSheet_Date, h.hours_hours have Hour_Number, h.hours_note have Hour_Note, (CASE WHEN h.ttick 'is too long. The maximum length is 8000.</p>
</blockquote>

<p>the exception is due to this line <code>EXEC (@exec) ;</code> .</p>

<p>So I need to know</p>

<ol>
<li>What is the reason of this error?</li>
<li>How can I fix it?</li>
</ol>