A method for bi-directional data replication between a Web Service application and a relational database are provided. In an electronic communications network, a computer implemented method is provided for generating indexes of relationship fields by accessing the metadata of a remote web service. A plurality of records may be downloaded from the remote web service to a computer. The plurality of records may include metadata related to the identity of data fields involved in parent-child record relationships. An index may be built at least partially on the data fields involved in parent-child relationships.