SAP (FI) Financial Accounting is an important core module where in live-time, the financial processing transactions are all captured to provide the basis via which data is drawn for external reporting. This SAP FI Module is integrated with many parallel modules that enable a company to unify processes that may have needed the utilization of many software packages.
SAP (CO) Controlling module is another important SAP modules offered to enterprises. The controlling module supports in the process works of planning, reporting and monitoring operations of businesses. It involves methods to view and organize costs that are required for financial reporting. Controlling module enables one to plan, track, perform and report about costs. Controlling includes managing and configuring master data that covers cost elements, cost centers, profit centers, internal orders, and functional area and so on.
You need to be from a commerce background qualification as to understand the accounting terminology and the accounting flow. Apart from this you need to understand the logic how the data is flowing in the SAP system.