Values for a measure does not show up

Hi Experts!

I have three tables in PowerBI desktop.

Contract: Business, Site_ID, Contract_ID

Date: DateID, Date

Sales: DateID, Contract_ID, Amount

Sales account is connected to other two tables based on DateID and Contract_ID. I need to get a Month-to_date summary on Business level and Site_ID level.

But the logic is, MTD values on Site_ID level, final daily MTD value should be positive. So all negative values should show as positive.

Then in Business level, all Site_ID level values should be added. That is all positive values should be added.

I added a measure and it works fine. 

MTD = 
CALCULATE(
    SUMX(FILTER(Contract, Contract[Business] = SELECTEDVALUE(Contract[Business])),
    IF(TOTALMTD(SUM(Sales[Amount]),Date[DATE])<0,TOTALMTD(SUM(Sales[Amount]),Date[DATE])*(-1),TOTALMTD(SUM(Sales[Amount]),Date[DATE]))),
    ALLSELECTED(Contract[Business])
)

But when I get this measure to a visual, the values are blank.

When i get a summary by Site_ID level, for some Site_IDs values show. For some nothing shows. BLANK.

I checked the relationships also, and those looked fine to me.

Can someone please help