User 
A person such as a production operator, engineer, supervisor, or system administrator who works with the SAP Manufacturing Execution system
Structure
Users can have the following attributes:
First Name and Last Name
Short Name
Status
Employee Number
Badge Number
Login ID and Password
Hire Date and Termination Date
User Group
User Type
Supervisor
Custom Data (see Custom Data)
For more information, see User Maintenance and Creating User Accounts.
Integration
You can assign users to user groups in either User Maintenance or User Group Maintenance.
You can assign certifications to users in User Certification Assignment Maintenance (see Certification and User Certification Assignment Maintenance).
You can configure user preferences in User Preference Maintenance (see User Preference Maintenance).
SAP ME ERP Integration
If you use the SAPMEINT component, see Transfer of Personnel Master Data with Qualifications.