As stupid as this may sound Turbotax has not programmed the form to disallow losses in excess of basis. I guess the only reason they have it because the IRS demands it under certain conditions. If you override you won't be able to e-file. the only you can limit your loss is to use form 6198. as you go thru entering k-1 info it should ask about at-risk. probably chose the simplified method. adjusted basis 1/1 same as you used for 7203. increase ? enter amount if any this would include any loans you made to it or capital contributions. decreases? losses and distributions loan repayments (note that any distributions in excess of basis are taxable and if you have made loans that have absorbed losses repayment will result in taxable income - turbotax really can't handle these situations) .
you should see on schedule E only the allowable loss.