Here is a list of Roles for SAP SRM (Supplier Relationship management) component.
SAP SRM: Invoice Verification Clerk
Technical name: /SAPSRM/ACCOUNTANT
SAP SRM: Administrator
Technical name: /SAPSRM/ADMINISTRATOR
SAP SRM: User Administrator
Technical name: /SAPSRM/ADMINISTRATOR_USR
SAP SRM: Bidder
Technical name: /SAPSRM/BIDDER
SAP SRM: Employee
Technical name: /SAPSRM/EMPLOYEE
SAP SRM: Manager
Technical name: /SAPSRM/MANAGER
SAP SRM: Operational Purchaser
Technical name: /SAPSRM/OP_PURCHASER
SAP SRM: Component Planner
Technical name: /SAPSRM/PLANNER
SAP SRM: Internal Dispatcher
Technical name: /SAPSRM/RECIPIENT
SAP SRM: Purchasing Assistant
Technical name: /SAPSRM/SECRETARY
SAP SRM: Strategic Purchaser
Technical name: /SAPSRM/ST_PURCHASER
SAP SRM: Supplier
Technical name: /SAPSRM/SUPPLIER
SAP SRM: Survey Owner
Technical name: /SAPSRM/SURVEY_OWNER
SAP SRM: Survey Reviewer
Technical name: /SAPSRM/SURVEY_REVIEWER
Authorization for accessing SRM Enterprise Services
Technical name: /SAPSRM/ENTERPRISE_SERVICES
SAP SRM One Client: Invoice Verification Clerk
Technical name: /SAPSRM/1C_INVOICER
SAP SRM One Client: Supplier
Technical name: /SAPSRM/1C_SUPPLIER
SAP SRM Supplier Self-Services (SUS) : Administrator Purchaser
Technical name: /SAPSRM/SUS_ADMIN_PURCHASER
SAP SRM Supplier Self-Services (SUS) : Administrator Supplier
Technical name: /SAPSRM/SUS_ADMIN_SUPPLIER
SAP SRM Supplier Self-Services (SUS) : Bidder
Technical name: /SAPSRM/SUS_BIDDER
SAP SRM Supplier Self-Services (SUS) : Dispatcher
Technical name: /SAPSRM/SUS_DISPATCHER
SAP SRM Supplier Self-Services (SUS) : Invoicing Party
Technical name: /SAPSRM/SUS_INVOICER
SAP SRM Supplier Self-Services (SUS) : Manager
Technical name: /SAPSRM/SUS_MANAGER
SAP SRM Supplier Self-Services (SUS) : Order Processor
Technical name: /SAPSRM/SUS_ORDER_PROCESSOR
SAP SRM Supplier Self-Services (SUS) : Supplier Screener
Technical name: /SAPSRM/SUS_ROS_PROCESSOR
SAP SRM Supplier Self-Services (SUS) : Scheduling Agreement Release Processor
Technical name: /SAPSRM/SUS_SAR_PROCESSOR
SAP SRM Supplier Self-Services (SUS) : Service Agent
Technical name: /SAPSRM/SUS_SERVICE_AGENT
SAP SRM Supplier Self-Services (SUS) : Central Service Entry Clerk
Technical name: /SAPSRM/SUS_SERVICE_MANAGER
Also Read : SAP SRM tutorial