This dialog box lists the constraint files for your project, and enables you to import your new constraint files or to ignore changes and keep the implementation as it is. This dialog box appears when there is a discrepancy between the files in your Libero project and the Designer implementation within your Libero project.
Import all files using new Libero Project source list - Removes the source files in your Designer implementation and imports the source files in your Libero IDE project. Selecting this option invalidates your layout; you must re-compile and re-layout your design if you import new files.
Keep the existing source list in my Designer implementation - Keeps the constraint files in your current implementation (with options described below); select this option if you do not want to import new files and re-compile and re-layout your design.
Apply to current design session only - If you select this option, constraint files in your current implementation are kept only for this session and this dialog appears again the next time you open the design. If you de-select this option, your choice is permanent; your current design implementation is preserved unchanged and any change executed previously in Libero IDE is lost.
Audit existing list (may re-import out-of-date files) - Some files used by your current design implementation have changed. Select this option to replace old files with the new ones detected on your disk. The import does not happen automatically; you must select the files you wish to import in the Audit dialog box that follows.