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About the PL/SQL Compilation Messages Window

The PL/SQL Compilation Messages window displays error messages, if any, generated as a result of compilation. Clicking on an error message highlights it, scrolls the Source pane to the offending source statement, and positions the text cursor at the location of the error.

By default, the Compilation messages pane appears only when there are compilation error messages generated. However, you can display the Compilation messages pane at any time by moving the split bar at the bottom right corner of the editor.