Advance your Data & AI career with 50 days of live learning, dataviz contests, hands-on challenges, study groups & certifications and more!
Get registeredJoin us at FabCon Atlanta from March 16 - 20, 2026, for the ultimate Fabric, Power BI, AI and SQL community-led event. Save $200 with code FABCOMM. Register now.
Solved! Go to Solution.
Hi @Alde ,
I have created a simple sample, please refer to my pbix file to see if it helps you.
Create a measure.
Measure = IF(ISFILTERED('Table'[month])=TRUE(),FIRSTNONBLANK('Table'[value%],1),CALCULATE(SUM('Table'[value%]),'Table'[month]=SELECTEDVALUE('Table (2)'[date])))
What cause your error?
The following comparisons are not supported:
More details: DAX error: A function ‘XXXX’ has been used in a True/False expression that is used as a table filter...
If I have misunderstood your meaning, please provide your pbi file without privacy information and your desired output.
Best Regards
Community Support Team _ Polly
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
Hi @Alde ,
I have created a simple sample, please refer to my pbix file to see if it helps you.
Create a measure.
Measure = IF(ISFILTERED('Table'[month])=TRUE(),FIRSTNONBLANK('Table'[value%],1),CALCULATE(SUM('Table'[value%]),'Table'[month]=SELECTEDVALUE('Table (2)'[date])))
What cause your error?
The following comparisons are not supported:
More details: DAX error: A function ‘XXXX’ has been used in a True/False expression that is used as a table filter...
If I have misunderstood your meaning, please provide your pbi file without privacy information and your desired output.
Best Regards
Community Support Team _ Polly
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
Hi @Anonymous
Thanks for the sample, it did work until 2nd level of nested DAX,
When I tried this one, It doesn't work anymore at 3rd level while I'm trying to create a clustered stacked bar, but it works if I just use a value "Value" instead of SELECTEDVALUE().
Do you have any idea? 🥹
Thank youuuuuu
BUD_OB2 =
SUMX('Col_Type',
VAR CurrentType = 'Col_Type'[Col_Type]
Return if
(CurrentType="OB YEAR BUDGET",
if (ISFILTERED('ORDER_TABLE'[MONTH])=truE(), FIRSTNONBLANK('FCST_BUD'[OB (start of month) BUD FY 42],1),
CALCULATE(Sum('FCST_BUD'[OB (start of month) bud FY 42]), 'FCST_BUD'[Month] = SELECTEDVALUE(Col_Type[CurrentMonth]))
)
)
)
Hi @Alde ,
I cannot reproduce your issue. Could you please provide your pbix file without privacy information and desired output? If impossible, colud you please provide enough sample data to reproduce the issue?
Best Regards
Community Support Team _ Polly
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
Hi @Anonymous
Here's the PBI sample file and attached an image for my idea.
Please help, thank youuuuu <33
https://drive.google.com/file/d/128YEVdMEsiBYfMy-R6J4SowibiA-sXoC/view?usp=sharing
OBActual_OB =
SUMX('Col_Type',
VAR CurrentType = 'Col_Type'[Col_Type]
Return
if
(CurrentType="OB Actual",
IF
(ISFILTERED('ORDER_TABLE'[MONTH])=False(),
CALCULATE(Sum('obcb'[OB Actual]), 'obcb'[Month] = "mar"),
FIRSTNONBLANK('obcb'[OB Actual],1)
)
)
)
Hi @Alde ,
I don't have access so I can't get your pbix file.Could you please provide again or use another way?
Best Regards
Community Support Team _ Polly
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
@Anonymous
Finally I got the solution, it didn't work because I put the CurrentMonth column in the same table of the month used to check against, now i created another table without making any relationship and use it in the conditional query.
OBActual_OB =
SUMX('Col_Type',
if
('Col_Type'[Col_Type]="OB Actual",
IF
(ISFILTERED('ORDER_TABLE'[MONTH])=True(),FIRSTNONBLANK('obcb'[OB Actual],1),
CALCULATE(Sum('obcb'[OB Actual]),'obcb'[Month]= SELECTEDVALUE(lastdatamonth[LastMonth]))
)
))I'll open to public, please access again a few sec later.
I'd like to use data from 'Col-Type'[Current_Month) in stead of typing "Mar" in the measure, cuz there's be a few dozens of them to use, I can't update all of them every month. Thank youu.
Ahh, I also tried assigning a variable the value using SELECTEDVALUE() function and using it at third level, and changing back and forth of the nests, but still doesn't work unless it's a typed value,
Hi,
Share some data and show the expected result.
Join the Fabric FabCon Global Hackathon—running virtually through Nov 3. Open to all skill levels. $10,000 in prizes!
Check out the October 2025 Power BI update to learn about new features.
| User | Count |
|---|---|
| 79 | |
| 38 | |
| 31 | |
| 27 | |
| 27 |