Error handling with DAX

[Reetz]

Silly question, but Is there a way to write a DAX formula to show a message  instead of the error box?  I've tried iferror, but I still get this error box.  I'd like to display "0%" or "value not available" instead.

Thanks!!

[Greg_Deckler]

I think there is also ISERROR but it suffers the same limitations.

[Greg_Deckler]

Well, it depends on the error if iferror can catch it or not. What is the error you are getting? If it is trying to compare different data types, that is one of the errors it doesn't catch but I created a work-a-round for it somewhere on this community. It was regarding strict and loose comparisons.

[Reetz]

@Greg_Deckler Thanks for the quick reply!  I am getting a "calculation error in measure: A table of multiple values was supplied where a single value was expected." 

My table has a column with 2 values, "Pre-implementation" and "Post-implementation".  My measure calculates totals based on these values.  I also have a slicer for these values.  The totals are accurate if either Pre or Post implementation is chosen in the slicer but I get the error when both are chosen.

[Anonymous · Accepted solution]

Use the HASONEVALUE or HASONEFILTER function to discover whether one, no or more values have been selected and build a conditional logic to display what you want in each case.

Best
D

[Greg_Deckler]

@Reetz So what should happen if both are chosen? You can check for this condition by using HASONEVALUE and avoid the error.

[Reetz]

If both are chosen, I'm trying to show "Pre/Post Implementation" and the total of everything.