As an alternative solution, you can always search on additional attributes in any of the native Active Directory search components. To get direct reports for a given user, try these steps:
1) Open a Get Users with Details Component and go to the Input Tab, make sure to select the "set of fields" radio button.
2. Click the Ellipsis next to "Additional Attributes", Select "Dynamic Value" and click "Edit"
3. In the Mapping Portion, make sure you add a single value mapping for "Attribute" then right click on "name" and create a constant mapping with the value of 'manager' all lower case. Then map the target manager's "DistinguishedName" to the "Value" on the right.
This should provide a list of all direct reports with the proper data type. You can also do this with any other AD Attribute native to active directory or custom.
Jason