Unique value

HI ChiRomeu 
Usually this requires an index column easily added using power query with one click. However, if this is not possible for any reason you can create a new calculated table as follows. (refer to attached sample file)

Where 'Data' is the original table

Data New = 
VAR Items = CONCATENATEX ( Data, Data[MasterId], "|" )
VAR Length = PATHLENGTH ( Items )
VAR T1 = GENERATESERIES ( 1, Length, 1 )
VAR T2 = ADDCOLUMNS ( T1, "@Index", [Value], "@MasterID", PATHITEM ( Items, [Value] ) )
VAR T3 = 
    ADDCOLUMNS ( 
        T2, 
        "@UniqueValue", 
        VAR CurrentID = [@MasterID]
        VAR CurrentIndex = [@Index]
        VAR FirstIndex = MINX ( FILTER ( T2, [@MasterID] = CurrentID ), [@Index] )
        RETURN
            IF ( CurrentIndex = FirstIndex, 1, 0 )
    )
RETURN
    SELECTCOLUMNS ( T3, "Master ID", [@MasterID], "Unique Value", [@UniqueValue] )