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It is placed when you include it into silkscreen gerber file. Verify your gerber before sending it to manufacturer by opening it in a viewer like CAM350 or by importig it back into Editor.
If you dont' see any refdes then go to manufacturing-artwork and edit particular silkscreen gerber by pressing right mouse button ot it. In popup window include class REFDES-SILKSCREEN_TOP into gerber by setting a checkbox.