Adding Worker Payroll Name to Custom Timecard Report

I have multiple custom timecard reports being developed. In these reports, I need to include the Pay Frequency (Payroll Name/Worker Payroll Name). The reports are developed in the Workforce Management - Processed Time Cards Real Time subject area. I am trying to join this with the Workforce Management - Worker Assignment Real Time subject area. I am able to add facts (Processed Hours & Head Count) from each subject areas without errors appearing. However, an error occurs each time I try to add a specific column for a certain hours time type from either time card subject area and the