I guess, the checkbox works on the below theory:
When you add a resource to a project, the default staff OBS unit for the project (if defined) is used to find and add resources to the project.
The project default staff OBS unit is a field on the scheduling properties page. You can define the resource staff OBS type using the Staff OBS Unit field on the staff member properties page.
The following rules are used when adding resources to projects:
- If the defined resource and the project OBS units vary, then the resource OBS unit is left undefined (blank).
- If the project OBS unit is not defined, then the resource OBS unit is left undefined (blank).
- When booking a requisition, the booked resource staff OBS value is set using the same rules as replace.
NJ