@taxpayers: I don't know the 100% correct way to fix this -- whether you have to amend or whether you can just make things right in 2018. I suspect, assuming there's no tax impact, you can just fix 2018 but you may want to get CPA advice on that.
As for where SUN went in 2017, I'm not sure what's correct. ETP didn't report it, but SUN (Sunoco LP) still exists as a ongoing concern (and also shows up in the 2018 ET K-1). So merging it with ETP may be correct, or the only thing that makes sense given the lack of info, but you may want to contact taxpackagesupport, or investor relations for ET, to see if they can tell you if it was combined or sold.
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**Note also, I'm not a Tax Preparer/CPA. Just a volunteer, seasoned, TurboTax user.
Use any advice accordingly!
