An issue has been reported in Reckon APS Tax 2020.3.1 where the following error is triggered in some individual tax returns when rolling over from 2019 to 2020.
Object Reference not set to an instance of an Object
The problem described in this article is fixed in Reckon APS Tax 2020.4.0 (reference TAX-466).
Delete and re-create the return without rollover the return will resolve the issue. All the share rental properties and assets data will appear in the return from the share party.