A correlation set is a set of properties shared by all messages in the correlated group. These properties must be defined in a WSDL file imported into the BPEL process.

The first step is to create a correlation set. In order to create a correlation set, first click on the Correlation icon (up and down green arrow icon) on the JDeveloper, as shown in the following screenshot. Second, click on the green plus sign on the Correlation Sets window, as shown in the following screenshot that will open the Create Correlation Set window. Third, enter the Name and click on OK. Another option to create a correlation set is to create it from Invoke and Receive activities.

In JDeveloper, double-click on the Receive activity on BPEL on the Design view as shown in step 1 of the preceding screenshot. It will launch the Edit Receive window, as shown in the following screenshot. Click on the Correlations tab and populate the Correlation Set and Initiate values, as shown in steps 2 and 3 of the following screenshot. Click on OK.