Sum of turnover where no reference price exists

[RonSon2015]

Hello,
I've the following issue. I've got 3 table.
a) fact table - includes actual turnover on material number level
b) calendar
c) reference price - linked to fact table by material number (is only a reference but is not the price per item to calculate turnover)

I want to calculate the turnover for all materials that have no reference price. May current formula which works on material number level:

Sum_missing_ref-price YTD CY (EUR) :=
IF (
    ISBLANK (
        CALCULATE (
            SUM ( REF_price[EU reference price) (EUR)] );
            DATESYTD ( 'Calendar'[Date]; "12/31" )
        )
    );
    [Turnover YTD CY (EUR)];
    0
)

However, I don't get a sum on overall level (result is blank for sum over materials that have reference prices and have not reference prices.

The following formula gives me no results. Even not on single material level.

Count_missing_ref-price YTD CY (EUR)2 :=
CALCULATE (
    SUM ( Sales_Cond[Condition value (LC)] );
    FILTER (
        REF_price;
        IF (
            ISBLANK (
                CALCULATE (
                    SUM ( REF_price[EU reference price (EUR)] );
                    DATESYTD ( 'Calendar'[Date]; "12/31" )
                )
            );
            [TGS YTD CY (EUR)];
            0
        )
    )
)

What am I doing wrong?

Thanks in advance for any hints.

[wdx223_Daniel · Accepted solution]

Sum_missing_ref-price YTD CY (EUR) :=
sumx(values(facttable[material_id]);IF (
    ISBLANK (
        CALCULATE (
            SUM ( REF_price[EU reference price) (EUR)] );
            DATESYTD ( 'Calendar'[Date]; "12/31" )
        )
    );
    [Turnover YTD CY (EUR)];
    0
))