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This is a special type of single question, which you can set up as either a table lookup question (go to Table Lookup Questions for more information) or as a hierarchy question (go to Hierarchy Questions for more information).
The question details page includes a number of fields and options. All the properties available for this question type are described in the Question Properties documentation (go to Accessing Question Properties for more information).
Figure 1 - The Table lookup / Hierarchy item's question details page
Note that the Schema and Table fields cannot be empty.