This template produces no output. The ((sfn)) and ((harv)) families of short-cite templates can emit error messages identifying short-cite templates that cannot find the target anchor to which they are supposed to link.
The short-cite templates cannot always locate anchor IDs that do exist – for the technical details, see Category:Harv and Sfn template errors. These unseen anchor IDs cause the short-cite templates to emit false-positive error messages. The purpose of ((sfn whitelist)) is to hold a list of valid anchor IDs so that the short-cite error message is suppressed.
Usage
If a series of short-cite templates are reporting no-target errors for these example valid anchor IDs:
CITEREFBrand1968,CITEREFFine1994,CITEREFGeanakoplos1959, andCITEREFVan_Tricht2011
somewhere in the article (in or near the appropriate reference section is probably best) add this:
((sfn whitelist|CITEREFBrand1968|CITEREFFine1994|CITEREFGeanakoplos1959|CITEREFVan_Tricht2011))
The anchor IDs should be copy/pasted directly from the short-cite template's error message.