Summarize table

Hi friends, 

I want to create a calculated table using Summarize function which contains "Sales" and "Cost" measure. 

Sales = CALCULATE(SUM(F_Sales[NetSales]), 
TREATAS(VALUES('D_Table'[year_month]),F_Sales[yearmonth]), 
TREATAS(VALUES('D_Table'[customer_no]),F_Sales[customer_no]))

Cost = CALCULATE(SUM(F_Cost[Cost]),
                        TREATAS(VALUES('D_Table'[sup_code]), F_Cost[sup_code]),
                        TREATAS(VALUES('D_Table'[year_month]),F_Cost[year_month]), 
                        TREATAS(VALUES('D_Table'[Product]),F_Cost[Product]))

Here is my calculated table:

Summarize_table = 
SUMMARIZE(D_Table,
                            D_Table[rep_code],
                            D_Table[sup_code],
                            D_Table[year_month],
                            D_Table[product],
                            D_Table[Region],
                            "Sales",[Sales]
                            ,"Cost",[Cost]
                            )

I compare the Sales measure and Cost measure in original table with Sales and Cost column in Summazie_table. The Sales gave me correct number. However, the cost made alot of difference. 

I had no idea why I used exactly the same measures Sale and Cost in summarize_table. However, the result of cost is different. I want it exactly the same. 

Could anyone please help me to solve it out?

Thank for your help.