Window function(OVER) equivalent in calculation view

Hi All,

I am trying to find a equivalent function that can replicate window function in calculation view.

Below are SQL that I am trying to replicate in Hana View

SELECT CATEGORY, ITEM, SUM(SALES) OVER (ORDER BY SALES) as CumulativeSales, 0 as TotalSales FROM SALES

The script above basically doing a running total on sales.

Raw Data

Expected result

Anyone have any idea what's the equivalent of "OVER" in calculation view?

Regards,

Kang