Proper way to Correct Sch E Expenses from DST Sponser

[James Sun]

My DST sponser made a mistake on the expense amount (off by a factor of 8!) on my Schedule E from 2017 and this year corrected it by adding the missing expense to the 2018 Schedule E. The amount is not trivial and caused a tax liability for me last year. If it was correctly inputted, I would have had no liability and had carry over losses. However, by adding the missing expense amount to the 2018 Schedule E, nothing really gets changed on my 2017 taxes. Is this really the legal way to correct such an error?