A personnel number is a unique identifier for an employee in the SAP system. A personnel number can be directly assigned to the following objects:

C. Work center. A work center is a location where maintenance activities are performed. A work center can have one or more personnel numbers assigned to it, which represent the employees who work at that location. The personnel numbers can be used for capacity planning, scheduling, and confirmation of maintenance orders1.

D. Business partner. A business partner is a person or an organization that has a business relationship with the company. A business partner can have one or more roles, such as customer, vendor, or contact person. A personnel number can be assigned to a business partner role, which allows the system to identify the employee who is responsible for the business partner or who acts as a contact person for the business partner2.

A personnel number cannot be directly assigned to the following objects:

A. Planner group. A planner group is a group of employees who are responsible for planning and processing maintenance orders. A planner group is assigned to a maintenance order header, but not to a personnel number. A planner group can have one or more work centers assigned to it, which in turn can have personnel numbers assigned to them3.

B. Maintenance plan. A maintenance plan is a document that defines the frequency and scope of preventive maintenance activities for technical objects. A maintenance plan is assigned to a maintenance item, which contains the technical object and the task list for the maintenance activities. A maintenance plan does not have a direct assignment to a personnel number, but it can have a planner group assigned to it, which can have work centers and personnel numbers assigned to it. References: 1: Work Center 2: Business Partner 3: Planner Group : [Maintenance Plan]