No, it is not necessary to get a corrected 1099-Int due to WA vice CA being noted in box 15. First, there was not withholding so you can actually leave the 15, 16 and17 blank just like the 2nd 1099-Int.
Next, WA does not tax interest earnings anyhow.
Finally, assuming you are the trustee and reside in CA, after entering the income in the federal interview the amounts will automatically flow to the resident state return interview; no matter what is entered in box 15.
If there were withholding or the income was taxable in another state you would've needed to create a non-resident state return for that state and allocate the portion of income that belongs in the non-resident state. Your resident state will still tax the income but offer a credit for taxes paid to another state.
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