UTA Peers Combo Box
From SmartWiki
Displays a combo box of all Level 2 activity custom field values for Level 2s that have the same Level 1 parent.
Use the custom field Options box to specify the custom field you want to display and optionally Level 2 types you want to filter.
Sample
field=123456
OR
field=123456,234567
OR
field=123456
type=222,333,444,555
where type is the L2 type ids to be filtered on
To address items in this field in a browser these additional options are used:
ajax=assignVar
return=list of custom field ids
The custom field can only be used in the UTA.