The taxable merger of Seattle SpinCo with MFGP resulted in a loss for me, but a loss is not allowed per the terms of the merger. How do show this in TurboTax?

63 shares of Seattle SpinCo with a cost basis of $310.93 redeemed/exchanged at $253.84 for 8 shares of MFGP and $20.58 cash in lieu of fractional shares. This results in a loss, but a loss is not allowed in the terms of the merger.