An issue has been reported in Reckon APS Tax 2020.4.0 where the following error is triggered in some individual tax returns with PSI as Type of Activity for Business Income.
VR.ATO.GEN.438010 Does your income including an individual's personal service income?
The problem described in this article has been identified as a bug and to be fixed in APS Tax 2020.5.0. The Validation Rule requires to have an Expenses against PSI included in profit and loss in the Business Income worksheet.
The workaround is to change the PSI to NPP for Type of Activity of the Business Income.