Image
Here you can specify the filename of an image, which will be used to represent the item. This parameter is mandatory if the display type of the custom field is "Images", otherwise it is optional, because then the images are only needed for context menues/drop-down boxes and there the "DisplayString" is sufficient.
See BCSTechManual, chapter 1.2.5 "Customizable image files" for more information about requirements for the images and files.
Possible values:
Default value: