The Query configuration is analog to the Tables respectively the Layer Queries Configuration.
Because no list of possible values can be retrieved by WebOffice 10 R3, there is the limitation that only input type Text input is supported. You can only choose values from a value list or big input list, if you configure a Lookup on the search field (See chapter Lookup Configuration for details). Another Limitation is that the search results of a WFS Query can not be restricted / used for MapTip and Free Labeling.
Field Names (e.g. for Search field list) can be resolved out of the schema. The fields are the child elements of the WFS Features (analog to layers), so the field names are stored in the name property.

Field name in name property of Field in WFS schema

Fieldname of result field