Details of how you use the Edit pane of the Message Mapping Editor.
When you have selected a source or target element, use the Edit pane to enter an expression. Right-click inside the Edit pane to invoke a list of available actions, most of which are standard Windows® functions, such as cut, copy, and paste. Click (or press Ctrl+Space) to access ESQL Content Assist, which provides a drop-down list of functions that are available in a Mapping node.
To display the definition associated with a selected element or database object, right-click in the Edit pane, and click Open Declaration. The appropriate editor opens to display the definition associated with the element or database definition.