Strange concatening text result

Hi everyone, I'm trying to build a new cube and I'm struggling to figure out a solution when I got the same id that change contract during the year, anyway I know this is TSQL forum my question is:

I got this code,

SELECT        ccoffice, customername, setdate, ccoffice + 
cast(YEAR(setdate) as varchar (2)) + CAST(MONTH(setdate) as varchar(2)) AS Expr1
FROM            headquarter

The row is

100500  Paris   2014-04-13

the result is :

100500 Paris   100500*4

I'm looking for

100500201404

Even if I know that's is not a solution for my new cube ( but that's another story).

Any suggestion?

Thanks