Flatbed Child Item Properties
The child items of a WIA flatbed scanner item are required to support the following WIA properties:
Note The WIA_IPA_ITEM_CATEGORY property must be set to WIA_CATEGORY_FLATBED for both flatbed items and flatbed child items.
Child items can optionally support any other property that is supported by the parent item, except for the WIA_IPS_SUPPORTS_CHILD_ITEM_CREATION and WIA_IPS_SEGMENTATION properties.