Hire Report - Two subject area report erroring with two measures

Summary:

Hello, we are building a hire report using the Workforce Management - Worker Assignment Event subject area and we only need one field from the Workforce Management - Person Real Time subject area. We added in a measure from each of the two subject areas then added in the field we needed (which is the external identifier "type" field). The report will run when we add each of the two measures and it will provide results (although it runs slower when we add in the Person Real Time SA). However, when we add in the external identifier type field, it