problem with duplicate key violations

DECLARE @startp int, @startr int,@alldatacount int, @tableA int,@tableAcount int, @tableB int,@tableBcount int
SELECT @startp=MAX(QID) FROM serverA.databaseA.dbo.tableA
SELECT @startr=MAX(QID) FROM dbo.tableA
if(@startp > @startr)
BEGIN
	DECLARE @alldata TABLE (pQID int not null,TimeSS datetime not null,UserID varchar(16) not null,
	AcctID varchar(16) not null,Symbol varchar(25) not null,Desk varchar(20) not null,Strategy varchar(20) not null,
	CurrentNet bigint not null, TodayBought bigint not null,TodaySold bigint not null,
	rQID int not null,rType varchar(10) not null,rAmount decimal(18,4) not null)
 
	INSERT @alldata (
		   pQID,TimeSS,UserID,AcctID,Symbol,Desk,Strategy,CurrentNet,TodayBought,TodaySold,rQID,rType,rAmount)
	SELECT 
		   p1.QID,p1.TimeSS,p1.UserID,p1.AcctID,p1.Symbol,p1.Desk,p1.Strategy,p1.CurrentNet,p1.TodayBought,p1.TodaySold,
		   p2.QID,p2.Type,p2.Amount
	FROM 
		   serverA.databaseA.dbo.tableA p1 INNER JOIN serverA.databaseA.dbo.tableB p2	
		    ON p1.QID = p2.QID AND p1.TimeSS >= CONVERT(CHAR(8),GETDATE(),112) 
		   WHERE NOT EXISTS(SELECT 1 FROM dbo.tableA r1 	
							WHERE p1.QID = r1.QID)
							
		  SET @alldatacount = @@ROWCOUNT
		  SELECT CONVERT(VARCHAR,@alldatacount) + ' Records copied to @alldata.'
		  IF(@alldatacount > 0)
		  BEGIN
			SET IDENTITY_INSERT tableA ON
			INSERT dbo.tableA(QID,TimeSS,UserID,AcctID,Symbol,Desk,Strategy,CurrentNet,TodayBought,TodaySold)
			SELECT pQID,TimeSS,UserID,AcctID,Symbol,Desk,Strategy,CurrentNet,TodayBought,TodaySold
			FROM @alldata
			SET @tableAcount = @@ROWCOUNT
			SET IDENTITY_INSERT tableA OFF
			SELECT CONVERT(VARCHAR,@tableAcount) + ' Records copied to dbo.tableA from @alldata.'
			IF(@tableAcount >0)
			BEGIN
				INSERT dbo.tableB(QID,Type,Amount)
				SELECT rQID,rType,rAmount
				FROM @alldata q1 INNER JOIN dbo.tableA q2 ON q1.rQID = q2.QID
				AND q2.TimeSS >=CONVERT(CHAR(8),GETDATE(),112)
				SET @tableBcount = @@ROWCOUNT
				SELECT CONVERT(VARCHAR,@tableBcount) + ' Records copied to dbo.tableB from @alldata.'
			END
			IF(@@ERROR <> 0)
			BEGIN
				EXEC msdb..sp_send_dbmail @recipients= 'me',
				@subject='blah blah',
				@body='The synch job failed, please review.'
			END
		  END
END