An issue has been reported in Reckon APS Tax 2020.1.0 where the Rental Property to which this asset belongs field is blank after rollover to 2020. This issue affects the 2020 Individual tax returns with rental property assets. .
The problem described in this article has been fixed in Reckon APS Tax 2020.2.0.
Manually allocate the rental property to the asset which it belongs to.