It's weird. When I put the donations ($450 in my case) into Schedule A, the figure $300 doesn't carry over, but the $300 is indeed deducted in the righthand column. I found it impossible to e-file in another tax return, so I figure that's going to be a problem with the 1040-SR as well. So I've just over-ridden the blank entry, typed in the $300, and everything looks fine. I'll just mail it in and hope TurboTax gets this sorted by next year!
