SAP BC comes with its own web transaction SAP services that facilitate the retrieval of data from SAP R/3 systems and allow optimum access of web transactions (Fig.2.). This communication between web transactions and SAP BC takes place on the basis of HTTP and involves the exchange of XML documents with the contents of parameterized calls or their results. wtcSAP class sends and receives these documents with the help of the HTTP host adapter, converts the data into corresponding Java Script objects and acts as a Java Script API offering access to SAP R/3