The certification is based on following SAP course: SRM210 SAP Enterprise Buyer Configuration, (5 days). SRM is a very good area to get involve with if your main focus area is currently SAP MM or Workflow and of course if there is a demand.
So, based on a 5 day training plus study you can be 'SAP SRM Certified'. Certainly a lot easier than full blown functional certification (such as FI/CO, MM or SD) which will take 5 weeks of formal SAP training plus study.
For more details of areas covered in exam, see this SAP webpage
- Select "SAP SRM" and "Applications" and "Application Consultant"
- Select "mySAP SRM"