Thanks for the update.
We’ll review, and prioritize appropriately if we can repro.
DinakarDavid Shiflet [MSFT] commented
I just tried this with SSMS 17.7 and was able to copy a database from 2016 to 2017. Are there any particular types of objects that are present in the database that trigger the error?
Since it looks like you’re in the same ballpark as SSMS we will focus on other items for now.David Shiflet [MSFT] commented
SSMS takes 45 seconds just to export? How long to load the file first?