Regarding SAP below link will give you full and clear information. You can also do Certified Information Systems Auditor, being offered by ISACA, USA, which has global recognition and adds value to CA.
I personally wont degrade any of the course. Because both courses have such a global reputation and adds value to the resume. If you are looking for gud salary wise then choose SAP-FICO. If you are interested in audit field, then choose CISA. But doing both will never go waste for sure.