when you dispose of a passive activity those passive losses become non passive. each MLP stands to its own the passive loss from one can't be used to offset the passive income from another. so if you have two PTP's one with income and one with loss. the income will flow to schedule E and the loss will be suspended,
also, should you have one PTP with income greater than its prior year passive losses the amount of current year income = to prior year passive losses will show up in the passive column while the excess will be non-passive. just the strange rules that govern tax reporting for PTP's
