If there are no entries for the source document in its 'Current List' or the particular entry is missing, that suggests the source doc may be corrupt - you're not supposed to be able to delete an in-use citation. Either that or the citation's source isn't what you think it is. FWIW, all in-use citations in the 'Current List' have tick marks against them.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]