ERP is best career move for the young CAs to avoid the exploitation by CA firms and Indian industries. Accounting and controlling processes in any business are dominated by CAs, that's why they understand ERP better then anybody else. CAs play two roles in ERP Enviorment : 1. As a functional consultant 2. As a part of the implementation team.
SAP is the market leader in India, so most of the opportunites are in SAP FI/CO. The concessional courses available for CAs are the eLearning (i.e. self study) modules in FI and CO. It is better to have some working experience in any industry as a SAP user, before enrolling for these courses.
Certification exam comes after the completion of the courese. Certification is must to claim that you are an expert.
After having some experience as a functional consultant you can move to the implementation area. The courses in SAP implementation are very expensive and available as classroom teaching.
After gaining expertise and experience on SAP, one can easily have overseas assignments or move outside India permanently.