Problem with DISTINCTCOUNT when using DirectQuery since 24 November

[JesperMadsen90]

I have two Power BI reports, built in Desktop and now up and running in Service, both of them are since 24 of November 2023 not working due to a measure = DISTINCTCOUNT(Customer_Id). My other measures are working fine, and the DISTINCTCOUNT works if I switch to Import Mode, however this is not something I wan't due to the size of the datamodel. The DISTINCTCOUNT have worked just fine i DirectQuery mode before but recently (since 24 Nov 2023) are not working.

I get the following message in PBI Service in the visuals where the DISTINCTCOUNT is present.

"Expression.Error: We couldn't fold the expression to the data source. Please try a simpler expression.. ;We couldn't fold the expression to the data source. Please try a simpler expression.. The exception was raised by the IDbCommand interface."

Does anyone know the problem? Does it have something to do with the latest update?

//Jesper

[JesperMadsen90 · Accepted solution]

Problem was formating of the column in the native database, even if Power BI managed to convert the column to a decimal number the distinctcount function didn't work. After changes to the formatting av Customer_Id in our native database the problem was solved.

[Ahmedx]

pls try this

SUMX(VALUES(Customer_Id),1)
OR
SUMX(DISTINCT(Customer_Id),1)

[JesperMadsen90]

Thanks, but unfortunately same problem, seems to be to complex for DirectQuery mode.