An issue has been reported in Reckon APS Tax 2020.3.1 where the following error is triggered in some individual tax returns when synchronizing rental data:
Object Reference not set to an instance of an Object
The problem described in this article is under investigation by our development team with reference TAX-490. Please review all future release notes for a fix to this issue.
Delete the returns with share rental data. Re-create one of the returns with rollover. Re-create the other return without rollover.