Drill down items are so called because they are objects that are pre-populated in the tree view for navigating on structures, such as work breakdown, plant breakdown, or classification hierarchies.
A drill down item is defined to query the database and pre-populate the tree. It first evaluates the access control to see if it can run the query. If it can, it queries the database to find the item that matches the criteria and puts it in the tree view.
Where
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HomeCollectionDrillDown is the name of the object being retrieved, for example, SPFEquipment.
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Argument 1 is the interface to search.
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Argument 2 is the name of the object to get to put into the tree.
Drill down must use the Load Object client API. For more information, see LoadObject client API.