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I have a custom field in my SP Project. In my .xml file, I have a propertySchema and a user field inside it. Currently the field does not accept multiple users/groups. How can I change that?

I tried the following, but it didn't work:

    <Field Name="AlertUsers" DisplayName="Alter the following users: " Type="User" AllowMultipleValues="true" AllowMultiple="true">
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I know this is old, but thought I'd answer for completeness anyway.

For multiple users you should have: Type=”MultiUser” Multi-"True"

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I think it actually is Mult="True" (without the i)? – Robert Lindgren Apr 26 '13 at 7:43
I think you are right, – Mark Stokes Apr 27 '13 at 8:22

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