This video below shows how to check that staff do not have a secondary school association to their primary school for the current year. Next it shows how to update the homeroom value using the modify list function.
Two common errors with editing homerooms are the primary/secondary school issues as shown in the video below, as well as an invalid physical and mailing address for the staff member. If the address error comes up you would need to validate the address or delete them from both the physical and mailing fields.