User Defined Functions not working

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Posted on by rameshmukka

1,123

I've already enabled User Defined Functions on my app.

I see below errors on my Formulas property

'Type' is an unknown or unsupported function.

Name isn't valid. 'Text' isn't recognized.

Unknown type LibraryType.

Here is my simple code taken from MS Docs. What is going wrong here?

Library = [
    {
        Title: "The Hobbit",
        Author: "J. R. R. Tolkien",
        Genre: "Fiction"
    },
    {
        Title: "Oxford English Dictionary",
        Author: "Oxford University",
        Genre: "Reference"
    }
];
LibraryType := Type( [ { Title: Text, Author: Text, Genre: Text } ] );
LibraryGenre( SelectedGenre: Text ): LibraryType = Filter( Library, Genre = SelectedGenre );

Thanks,

Ramesh Mukka

Categories:

Building Power Apps

Error handling

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Kalathiya 2,456 Super User 2026 Season 1 on at

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Hello @rameshmukka,

Yes, to use the Type() function and define custom data structures in App, you need to enable the User-defined types feature.

How to enable it:

#1.Open your app.

#2. Go to Settings > Upcoming features > Experimental (or Preview)

#3.Turn on: User-defined types

If this response resolves your issue, please mark it as the Verified Answer so it can help other community members as well.

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Pstork1 69,556 Most Valuable Professional on at

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There is another switch you need to set in the Experimental section of the Settings called User-defined types. It doesn't work with just the User Defined Functions when using Type()

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