Sorry to sound snarky, but it doesn't matter if 4684 was done correctly.  The amount transferred from the 4684 should NOT just add to the itemized deductions on Sched A.  It should add to the Standard Deduction WHEN the itemized deductions are less than the Standard Deduction (very common these days).  For example, what if you don't itemize?  Will the loss be the only amount on Sched A?  Then, only that amount would transfer to the 1040, completely ignoring the Standard Deduction?  Looks like a ProSeries defect - unless I'm missing something.