When running my final check before e-filing my non-resident CA state return, the check tells me that any withholding must be entered on a Form 593. HOWEVER, the heading for the sheet where you fill in the Form 593 details says not to use that if the information has been entered elsewhere.
But this same withholding information is already entered in the Capital Gain (Loss) Adjustments worksheet. If you do both the withholding is mis-calculated by TT (doubled).
It appears that to correct the error requires either that that the Capital Gain (Loss) Adjustments Worksheet should make it clear exactly which other forms' information need not be duplicated there, including the CA 593, or (better) the reference to the Form 593 final check needs to be omitted.