You use this dialog box to configure the properties of On Message branch of the Pick element. The Pick activity is used to wait for one or several possible messages to arrive. The properties of this message that the process awaits from a partner service are configured in the Message Handler Property Editor.
The Message Handler Property Editor dialog box opens when you double-click the On Message branch of the Pick element or click the Property Editor in the Properties window for this element.
To add correlation sets to the On Message branch, click the Correlations tab.