Source Synchronization and Interactive Analysis

If you select a file that has been modified in the original location and try to run Impact Analysis, you will be notified that it has been changed and will be asked to synchronize the workspace.
Note: If you have selected the Synchronize the workspace after checking for outdated sources without asking me option in Options > Workspace Options > Registration > Source Synchronization, the workspace will be synchronized when you try to run Impact Analysis on a modified file.

The Source Synchronization window also pops up when you try to select a file that has been modified in the Objects pane in Interactive Analysis.