Default values for field parameter with language support?

[martinriddar]

I've got a field parameter to which I've added language support using the method describere here: Synchronize multiple field parameters - Power BI | Microsoft Learn

_p_location_resolution = {
    //english
    ("region", NAMEOF('dim terminal'[region]), 0, 1),
    ("country", NAMEOF('dim terminal'[country]), 1, 1),
    ("city", NAMEOF('dim terminal'[city]), 2, 1),
    ("terminal", NAMEOF('dim terminal'[terminal]), 3, 1),
    //swedish
    ("region", NAMEOF('dim terminal'[region]), 0, 2),
    ("land", NAMEOF('dim terminal'[country]), 1, 2),
    ("stad", NAMEOF('dim terminal'[city]), 2, 2),
    ("terminal", NAMEOF('dim terminal'[terminal]), 3, 2),
    //spanish
    ("región", NAMEOF('dim terminal'[region]), 0, 3),
    ("país", NAMEOF('dim terminal'[country]), 1, 3),
    ("ciudad", NAMEOF('dim terminal'[city]), 2, 3),
    ("terminal", NAMEOF('dim terminal'[terminal]), 3, 3)
}

A problem with this is that if I add a language to my model but forget to update all field parameters there is no fallback. I use this field parameter in a slicer and If I filter for a language that is not supported by the field parameter the slicer becomes empty.

My question is if it is possible to modify this in order to add a default definition?

I tried letting ChatGPT be creative and it came up with this:

_p_location_resolution = 
VAR SelectedLanguage = SELECTEDVALUE('languages'[ISO abbreviation], "en")
RETURN
    SWITCH(
        SelectedLanguage,
        "en",
            {
                ("region", NAMEOF('dim terminal'[region]), 0, 1),
                ("country", NAMEOF('dim terminal'[country]), 1, 1),
                ("city", NAMEOF('dim terminal'[city]), 2, 1),
                ("terminal", NAMEOF('dim terminal'[terminal]), 3, 1)
            },
        "sv",
            {
                ("region", NAMEOF('dim terminal'[region]), 0, 2),
                ("land", NAMEOF('dim terminal'[country]), 1, 2),
                ("stad", NAMEOF('dim terminal'[city]), 2, 2),
                ("terminal", NAMEOF('dim terminal'[terminal]), 3, 2)
            },
        "se",
            {
                ("región", NAMEOF('dim terminal'[region]), 0, 3),
                ("país", NAMEOF('dim terminal'[country]), 1, 3),
                ("ciudad", NAMEOF('dim terminal'[city]), 2, 3),
                ("terminal", NAMEOF('dim terminal'[terminal]), 3, 3)
            },
        // default to english
        {
            ("region", NAMEOF('dim terminal'[region]), 0, 1),
            ("country", NAMEOF('dim terminal'[country]), 1, 1),
            ("city", NAMEOF('dim terminal'[city]), 2, 1),
            ("terminal", NAMEOF('dim terminal'[terminal]), 3, 1)
        }
    )

But this gives the error "The expression refers to multiple columns. Multiple columns cannot be converted to a scalar value".

Unfortunately I'm too new to Power BI and DAX to determine if it's just a tiny fixable error or if I'm not allowed to write DAX code like this in a field parameter. I'm guessing that the field parameter definition is not reloaded when changing the language filter so it isn't possible to do something like this but hey, I got to ask.

[123abc]

The error you're encountering, "The expression refers to multiple columns. Multiple columns cannot be converted to a scalar value," indicates that one or more expressions in your DAX code are returning multiple values where a single value is expected. This typically happens when you're trying to return a table or multiple values in a context where a single value is required, such as a measure or a variable.

In your case, the issue seems to be related to the fact that you're trying to return multiple rows of values within the SWITCH function, which expects a single scalar value for each case.

To resolve this issue, you need to restructure your DAX code so that it returns a single value for each case in the SWITCH function. One approach could be to return a single concatenated string that represents all the fields for a given language. Here's how you can adjust your code:

_p_location_resolution =
VAR SelectedLanguage = SELECTEDVALUE('languages'[ISO abbreviation], "en")
RETURN
SWITCH(
SelectedLanguage,
"en", CONCATENATEX({"region", "country", "city", "terminal"}, [Value], ", "),
"sv", CONCATENATEX({"region", "land", "stad", "terminal"}, [Value], ", "),
"se", CONCATENATEX({"región", "país", "ciudad", "terminal"}, [Value], ", "),
// default to english
CONCATENATEX({"region", "country", "city", "terminal"}, [Value], ", ")
)

In this code:

• CONCATENATEX is used to concatenate the values of each field into a single string.
• The {} syntax is used to create an array of field names for each language.
• [Value] represents the value associated with each field.

This way, your DAX expression returns a single string for each language, which can be used as the default definition for your field parameter. Make sure to adjust [Value] with the appropriate expression that retrieves the values you want to concatenate for each field.

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In case there is still a problem, please feel free and explain your issue in detail, It will be my pleasure to assist you in any way I can.