I was trying to add it to minifigs to indicate that they come in that set and the submission got rejected. In hindsight, it makes sense, because the Comes In button probably pulls data from inventories.
That is a set number without hyphenated section. It is used by me to deal with set number reuse like with http://brickowl.com/search/catalog?query=6862 to stop the instructions and set pictures being attached to the wrong item.
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Brian