SAP Business Connector offers predefined services or listeners for accessing or invoking SAP R/3 that can be specialized to form flow-service in order to access a specific service from the SAP system. The various access and call options that are available in Business Connectors for SAP R/3 are shown in Fig.3.

The wtcSAP class contains a definition of the connection to the business connector and the SAP R/3 system data recall method for RFC and generic methods for invoking RFCs. However, individual RFCs and BAPIs can be defined and added as an option to the wtcSAP class by using proxy methods. In order to create a proxy first step is launching a Web Transactions application in the base directory using the start template wtcSAP_select. Its general index card defines the connection to the SAP BC and the SAP R/3 system. In the file name text box specify the file, which is to contain the proxy methods for your RFCs and BAPIs. In the Start up, proxies will indicate the methods already contained in this file. In order to create a proxy if you know the name of the RFC or BAPI you can directly create the template using create template. However, in order to search for the RFC or BAPI type use the lookup index card and click lookup. It gives you the list that might include the desired RFC or BAPI. By using appropriate link in the list you can create the proxy method. The code of proxy method is displayed in the proxy index card. After collecting all the desired RFCs and BAPIs together return to the general index card and click finish to save all pre-selected proxy methods to your file.