The expression refers to multiple columns. Multiple columns cannot be converted to a scalar value.

[proavinash]

please suggest a solution.

[v-saisrao-msft]

Hi @proavinash,

We haven’t heard back from you regarding your issue. If it has been resolved, please mark the helpful response as the solution and give a ‘Kudos’ to assist others. If you still need support, let us know.

Thank you.

[proavinash]

not working same error

[v-saisrao-msft]

Hi @proavinash,

May I ask if you have resolved this issue? If so, please mark the helpful reply and accept it as the solution. This will be helpful for other community members who have similar problems to solve it faster.

Thank you.

[DataNinja777]

Hi @proavinash ,

The error occurs because UNION() only accepts two tables at a time, but you're passing in three ADDCOLUMNS() results directly. DAX cannot interpret more than two tables unless you nest the UNION() calls. To fix it, you need to combine the second and third ADDCOLUMNS() calls using UNION() first, then combine that result with the first one. Here's the corrected version of your DAX:

MTD/QTD/YTD =
var TodayDate = TODAY()
var startyear = CALCULATE(STARTOFYEAR(SaleDump[Date].[Date]), YEAR(SaleDump[Date]) = YEAR(TodayDate))
var startquarter = CALCULATE(STARTOFQUARTER(SaleDump[Date].[Date]), YEAR(SaleDump[Date]) = YEAR(TodayDate), QUARTER(SaleDump[Date]) = QUARTER(TodayDate))
var startmonth = CALCULATE(STARTOFMONTH(SaleDump[Date].[Date]), YEAR(SaleDump[Date]) = YEAR(TodayDate), MONTH(SaleDump[Date]) = MONTH(TodayDate))
var result =
    UNION(
        ADDCOLUMNS(CALENDAR(startyear, TodayDate), "Selection", "YTD"),
        UNION(
            ADDCOLUMNS(CALENDAR(startquarter, TodayDate), "Selection", "QTD"),
            ADDCOLUMNS(CALENDAR(startmonth, TodayDate), "Selection", "MTD")
        )
    )
RETURN
    result

This corrects the structure so each UNION() has exactly two inputs and avoids the scalar value conversion error.

Best regards,

[proavinash]

SAME ERROR AGAIN.

[v-saisrao-msft]

Hi @proavinash,
I hope this information is helpful. Please let me know if you have any further questions or if you'd like to discuss this further. If this answers your question, please Accept it as a solution and give it a 'Kudos' so others can find it easily.
Thank you.

[v-saisrao-msft · Accepted solution]

Hi @proavinash,

Thank you for reaching out to the Microsoft Fabric Forum Community.

The UNION function returns a table as a result, so rather than creating a measure, try creating a calculated table.

Please refer the below Document:
UNION function (DAX) - DAX | Microsoft Learn

If this post helps, then please give us ‘Kudos’ and consider Accept it as a solution to help the other members find it more quickly.

Thank you.