Custom Field PropertySchema Type=User

Question

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:

<PropertySchema>
  <Fields>
    <Field Name="AlertUsers" DisplayName="Alter the following users: " Type="User" AllowMultipleValues="true" AllowMultiple="true">
    </Field>
  </Fields>
</PropertySchema>

Answer 1

I know this is old, but thought I'd answer for completeness anyway.

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