I think " ZZ was not needed and was just for informational purposes" is true. I still put those information in tho. I have done that for 3 years now. 8990 is the new thing from this year. But I happened to close my position as well, so I don't know if this is only happens becasuse of me selling all my position or something new.
Anyway, there are more complication when you close it. Now TT is asking about total sell price / partnetship basis etc. If I have a chance to do this all over, I will just buy ETF version of this.
For you, you should try to keep all the transaction documents for ET, you will need it to prove all your unit are sold etc
