I think the problem is that you're effectively double grouping. Try the following:

WITH SALES AS (

SELECT

period, kode_lang, namaprod,

kode_comp, kode_type, kodesalur, company,

SUM(sales) AS sales

FROM

nv..bi_data2015_v1

GROUP BY

period, kode_lang, namaprod,...

select

period, kode_lang, namaprod, kode_comp, kode_type,

kodesalur, company,

...

Have you tried running your query from your LEFT JOIN separately with a WHERE clause that just gets data for 201312 ?

That might help determine if it's a query problem,...