I believe this may be a bug with the default CPupgrade-tools-R82 scripts.
From my analysis, it appears that the R82 upgrade images (both ISO and Blink-HF34) ship with an older version of the CPupgrade-tools-R82 package, which seems to have a bug. On the affected system, the build number is:
[Expert@SMS-PRI:0]# cpprod_util CPPROD_GetValue CPupgrade-tools-R82 BuildNumber
1998001093
After deploying a new management server with R82 JHF34 and manually updating to the latest CPupgrade-tools-R82, I no longer encounter the error when importing the database. The updated build shows:
[Expert@SMS-PRI:0]# cpprod_util CPPROD_GetValue CPupgrade-tools-R82 BuildNumber
1998001165
I will let you know if the upgrade is successful.