Resources not being 'selected' in Telerik Scheduler Edit Dialog

[Matthew]

I've implemented Telerik scheduler on timeline view. I am allowing a M:M relationship between my y-axis resource (advocates) and Meetings. Here is what my scheduler looks like:

When I double click one of the instances of the meeting, the advanced edit dialog appears. However, in here, none of the advocates are selected as participants in the meeting:

There are a number of advocates for whom this meeting appears in the timeline. Why do they not get displayed as selected in the edit form?

The problem doesn't end there. I have a second type of resources (legislators). There is a similar problem here - I have relationships defined for this meeting and 4 legislators, but only the first legislator is checked (and the other three remain unckecked):

I need to add two other types of resources, and I expect that I will have a similar problem to the two I have already added.

I have been able to verify visually by changing the grouping of my scheduler and through SQL queries that the relationships in the database are valid. So, why am I unable to see each of these related resources checked? My scheduler code is as follows:

<telerik:RadScheduler runat="server" ID="RadScheduler1"
    AdvancedForm-Enabled="true"
    AllowEdit="true"
    AllowInsert="true"
    DataEndField="End"
    DataKeyField="ID"
    DataSourceID="EventsDataSource"
    DataStartField="Start"
    DataSubjectField="Subject"
    DayEndTime="17:00:00"
    DayStartTime="07:00:00"
    EnableAdvancedForm="true"
    Localization-HeaderMultiDay="Work Week"
    OverflowBehavior="Expand"
    OnAppointmentDelete="OnAppointmentDelete"
    OnAppointmentInsert="OnAppointmentInsert"
    OnAppointmentUpdate="OnAppointmentEdited"
    OnNavigationComplete="RadScheduler1_NavigationComplete"
    SelectedDate="9/20/2011"
    SelectedView="TimelineView"
    >
    <AppointmentContextMenuSettings EnableDefault="true" />
    <AdvancedForm Modal="true" />
    <ResourceTypes>
        <telerik:ResourceType KeyField="Adv_AdvocateID" AllowMultipleValues="true" Name="Advocate" TextField="Adv_FullName" ForeignKeyField="Adv_AdvocateID"
            DataSourceID="AdvocatesDataSource" />
    </ResourceTypes>
    <ResourceTypes>
        <telerik:ResourceType KeyField="Leg_LegID" Name="Legislator" AllowMultipleValues="true" TextField="Leg_FullName" ForeignKeyField="Leg_LegID"
            DataSourceID="LegislatorsDataSource" />
    </ResourceTypes>
    <TimelineView UserSelectable="true" GroupBy="Advocate" GroupingDirection="Vertical" />
    <MultiDayView UserSelectable="false" />
    <DayView UserSelectable="false" />
    <WeekView UserSelectable="false" />
    <MonthView UserSelectable="false" />
</telerik:RadScheduler>

I'm hoping someone can shed some insight into how to correctly display the selected resources in the edit appointment dialog, and I thank you in advance for your help.

[Matthew]

I don't see this question as being that advanced...surely someone would be able to reply, even if it is to tell me to get lost?

[Peter]

Hi Matthew,

You need to Implement A Provider That Supports Multi-valued Resources.

Only custom providers can provide the support to allow multi-valued resources (resources that can have multiple values assigned to a single appointment).

Kind regards,

Peter
the Telerik team