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E.g. if I've fallen for the bank teller fallacy and assigned Pr(Feminist) = 1/2, Pr(Feminist & Bank teller) = 3/4, I can be Dutch booked. Hmmm... now I'm thinking maybe this isn't what you were asking about?
Ah yeah that’s not quite it! I take it the DB shows that for any credence function that fails to be probabilistic its bookable: is there any argument that similarly shows that for any partial function it is somehow inadequate?
Ah! No, pretty sure not. Indeed you can prove that it will not be bookable, and will not be accuracy dominated. If there exists a "fleshing out" of that credence function which is a probability function, it's immune to Dutch book/accuracy domination.
There may still be arguments not to have a partial credence function, of course. By failing to assign a credence to A you fail to apportion your credence in A to the evidence! But this isn't friendly to the subjectivist. So much the worst for subjectivism 
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