Does anyone own the publicly traded MLP's Energy Transfer Partners and Sunoco Logistics?

ETP and SXL merged in 2017 with ETP being the surviving entity.  SXL provided a Final K-1 to me but I have been unable to figure out how to select the proper disposition in TT.  As I see it, TT provides for 3 kinds of disposition:  1.  fully taxable transaction(which it is not), 2.  Gift (it isn't), or 3.an installment sale (which it isn't).  In point of fact the terms of the merger provide each holder of SXL 1.5 shares of ETP for each share of SXL.  Additionally, SXL has a suspended passive loss carryforward which should be added to ETP's suspended passive loss carryforward, and again, TT has no method of transferring the acquired company's carryforward to the successor's carryforward.  I understand that I could manually override the successor company carryforward but that leaves no electronic trail.  Am I missing something