SAP

SAP is the worlds largest selling Enterprise Resources Planning (ERP) software system. For implementation of SAP you require ABAB developers and functional consultants. If you want to make career in Technical then you may learn ABAB and do certifications. In case you want to be a functional specialist, you can do one of more functional module certification. SAP professionals are paid above normal developers and Business Analysts. With SAP certifications you can join IT companies or IT department of business enterprises.
SAP functional modules are as follows:
(a) Human Resource Management (SAP HRM), also known as Human Resource (HR)
(b) Production Planning (SAP PP)
(c) Material Management (SAP MM)
(d) Financial Supply Chain Management (SAP FSCM)
(e) Sales and Distribution (SAP SD)
(f) Project System (SAP PS)
(g) Financial Accounting and Controlling (SAP FICO)
Based on your experience it is suggested that you do SAP ERP Sales and Distribution (SD) module. SD module provides a complete sales management solution for a broad range of industries. SAP SD treats the sales order process as a cycle of events which includes Pre-sales activities, Sales order processing, Inventory sourcing, Delivery, Billing and Payment. SAP SD is tightly integrated with SAP MM and SAP PP modules. If you have field experience in Sales then SAP SD certification will help you enhance your career. SAP CRM is an extension of SD to manage customers database. CRM provides detail so that management, salespeople, people providing service, and perhaps the customer directly could access information, match customer needs with product plans and offerings, remind customers of service requirements, know what other products a customer had purchased, and so forth.