I encountered some problems while trying to create a DataForm Task Roll-Up
webpart. All worked fine till i enabled multiple user selection on an task
list. After i enable this the tasks are no longer roll-upped. while the
result in @AssignTo only contains an extra name when you add an person. I
asked some collegea's and tried my friend google. But nothing that's any
help to solve this. I only found a site where someone had exactly the same
problem he also has this scenario:

> In task list in AssignTo field when "Allow multiple selections" value set
> to
> 'No", everything works fine.
> In task list in AssignTo field when "Allow multiple selections" value set
> to
> 'Yes, I get empty data.

This is the CAML Query i used to query all the task lists:

<View>
<ViewFields>
<FieldRef Name="ID"/>
<FieldRef Name="ContentType"/>
<FieldRef Name="Title"/>
<FieldRef Name="AssignedTo"/>
<FieldRef Name="Status"/>
<FieldRef Name="StartDate"/>
<FieldRef Name="DueDate"/>
<FieldRef Name="Created"/>
<FieldRef Name="FileDirRef"/>
<FieldRef Name="PermMask"/>
</ViewFields>
<Query>
<OrderBy>
<FieldRef Name="Status" />
</OrderBy>
<Where>
<Or>
<Eq>
<FieldRef Name="AssignedTo" />
<Value Type="Integer">
<UserID Type="Integer" />
</Value>
</Eq>
<IsNull>
<FieldRef Name="AssignedTo" />
</IsNull>
</Or>
</Where>
</Query>
<QueryOptions>
<ViewAttributes Scope='Recursive' />
</QueryOptions>
</View>