Hi Abdul,
You have to assign SAP_SMWORK_BASIC standard role to your user Id.
Other role which you might need
SAP_SMWORK_BASIC Work Center: Basic Authorization Objects
SAP_SMWORK_BPM Work Center: Business Process and Interface Monitoring
SAP_SMWORK_BPM Work Center: Business Process and Interface Monitoring
SAP_SMWORK_DIAG Work Center: Root Cause Analysis
SAP_SMWORK_IMPL Work Center: Implementation and Upgrade
SAP_SMWORK_INCIDENT_MAN Work Center: Incident Management
SAP_SMWORK_JOB_MAN Work Center: Job Management
SAP_SMWORK_LANDSCAPE_MAN Work Center: System Landscape Management
SAP_SMWORK_SERVICE_DEV Work Center: Service Delivery
SAP_SMWORK_SETUP Work Center: General Setup
SAP_SMWORK_SYS_ADMIN Work Center: System Administration
SAP_SMWORK_SYS_MON Work Center: System Monitoring
regards
kartik