The Merge Changes to Local Document dialog lets you inspect and approve (or reject) all the changes you are checking out of the repository.
This dialog will open if you are checking out a PowerDesigner model to an existing file on your computer and you have selected the Merge model option.
The repository version of the model that you are checking out is displayed in the left pane, and the local version is in the right pane. To filter the tree and show only the changes, click the Change Filter tool and select Show All Changes. By default, all the changes from the repository are selected to be applied. For detailed information about using this dialog, see Merging Models.