Transaction completing with out the process

Question

hi all
I have an SP which does Updation in table_1 and Table_2 Both having more than 8 columns where 4 columns are updating though this SP depends on the condition.
My problem is i wrote this Query under transaction Block to update 4 cols of both tables..where column_4 is a Bit datatype column. The issue is apart from this column_4 all other columns are updating though this SP and transaction does Commit.
  Why it is happening? 
I had also tried from application side and found data values are passing correctly to this Sp. also this is not happening in every cases it is happening only intermediatly . also development Server is not having such issue only production having this issue..Can
any one help to troubleshoot? my question is With out updating column_4 how transaction does commit. in what all senarios Transaction does commit like this?

Answer 1

Hi Jens...thanks for the Quick reply
Kindly have a look on the skeleton of my SP.
CREATE PROCEDURE Procedure_name 
 Col1 varchar(11),  
 col2 varchar(20),  
 Col3 varchar(100),  
Col4 datetime  
AS  
BEGIN  
 SET NOCOUNT ON;  
BEGIN TRY   
  BEGIN TRANSACTION BulkUpdate
IF (LOWER(@Col2) = 'Somestring') 
  begin   
   UPDATE table_1  
   SET   
     Col1 = 1,  
     Col4 = 1,  
     Col5 = @TimeStamp,  
     Col6 = 'Somesting'  ,
     Col2 = 'Completed'
   where Col7 = @Col3  
end
else if (LOWER(@Col2) = 'anotherString')
begin   
   UPDATE table_1  
   SET   
     Col1 = 2,  
     Col4 = 1,  
     Col5 = @TimeStamp,  
     Col6 = 'Somesting'  ,
     Col2 = 'Completed'
   where Col7 = @Col3  
end
IF (LOWER(@Col2) = 'Somestring') 
  begin   
   UPDATE table_2  
   SET   
     Col1 = 1,  
     Col4 = 1,  
     Col5 = @TimeStamp,  
     Col6 = 'Somesting'  ,
     Col2 = 'Completed'
   where Col7 = @Col3  
end
else if (LOWER(@Col2) = 'anotherString')
begin   
   UPDATE table_2  
   SET   
     Col1 = 2,  
     Col4 = 1,  
     Col5 = @TimeStamp,  
     Col6 = 'Somesting'  ,
     Col2 = 'Completed'
   where Col7 = @Col3  
end
 COMMIT  TRANSACTION BulkUpdate 
  END TRY  
 ROLLBACK  TRANSACTION BulkUpdate 
  DECLARE @ErrorMessage VARCHAR(4000);  
    DECLARE @ErrorSeverity INT;  
    DECLARE @ErrorState INT;  
    SELECT @ErrorMessage = ERROR_MESSAGE(),  
            @ErrorSeverity = ERROR_SEVERITY(),  
              @ErrorState = ERROR_STATE();
    RAISERROR (@ErrorMessage, 
    @ErrorSeverity,
    @ErrorState 
  END CATCH  
END