fixing circular reference in calculated column

[Dudeman]

Hello. 

I'm getting a circular reference I can't figure out how to fix when creating a calculated column version of a calculated measure.

Here is my workbook Airport code workbook (wetransfer link).

I've had some community help (thanks!) to get my calculated measure Result Destination working, but becuase I want to link two tables, I need it to be a calculated column instead. 

In the workbook I have the table setup exactly with the correct output. The circular reference is in a calculated column called Result Destination Col. I want to fix that and then replace the Result Desination measure with this column in my visualization.

Thanks so much.

[v-yalanwu-msft · Accepted solution]

Hi @Dudeman   ；

When you use Live connection, you can not add columns,  So maybe you could try to modify the MaxArrival2 column by the following formula:

MaxArrival2 =
CALCULATE (
    MAX ( 'Legs'[arrivalTime] ),
    FILTER (
        ALL ( 'Legs' ),
        [BookingNumber] = EARLIER ( [BookingNumber] )
            && [ArrivalDate] = EARLIER ( [ArrivalDate] )
    )
)

The final output is shown below:  

Best Regards,
Community Support Team_ Yalan Wu
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.  

[v-yalanwu-msft]

Hi @Dudeman  , 

You could create two columns by the following formula: 

MaxArrival2 = CALCULATE(MAX( 'Legs'[arrivalTime]),ALLEXCEPT ('Legs','Legs'[BookingNumber],'Legs'[ArrivalDate]))

Result Destination 2 =
IF (
    [arrivalTime]
        = CALCULATE (
            MIN ( [arrivalTime] ),
            FILTER (
                ALLEXCEPT ( Legs, Legs[BookingNumber] ),
                [arrivalTime] = [MaxArrival2]
            )
        ),
    [arrivalAirport]
)

The final output is shown below:  

Best Regards,
Community Support Team_ Yalan Wu
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.  

[Dudeman]

@v-yalanwu-msft thanks Yalan. That does work in the sample file and I appreciate the help so much.

However, when I try it in my actual file I'm unable to get the Calculate or AllExcept functions to work in the formula. I think it has to do with the fact I'm connected to a live PBI dataset my BI team has created (or the fact I'm on an Enterprise version of PBI maybe). 

Is there a workaround for live datasets? I tried to add the column to the Master Airports table, where it does work, but when I add it to the viz it breaks and a black box pops up and disappears very quickly with some kind of SQL error. I can't screenshot it - it's too fast.

Thoughts?

[HotChilli]

The first thing to do is to rewrite the column DAX so it's not using a measure i.e. [MaxArrival].  A calculated column should not use a measure (it's possible to do it but definitely not advisable)

Edit: I've just seen that [ArriveConnect] is a measure too so same advice applies.

[Dudeman]

Thanks @HotChilli. Do you know how I could re-write the DAX? I'm very new to all of this.

I'm not too sure how to re-write it becuase I need to be able to still reference something like MaxArrival and ArriveConnect to get my end result, don't I?