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If you want to add a diagram of domain elements to a model by using the Visualize > Add to New Diagram in Model file menu command, you must first open the target model, which will contain the new diagram to be created. If the target model is not open, you will not be able to add the new diagram to the model. If no open model is found in the workspace, you will receive a "No selection is available" error message in the Select New Diagram Owner wizard.
Sometimes the Harvest popup menu on domain modeling elements, excluding Java™ and C++ elements, in class diagrams might not be available.
Workaround: To make the Harvest menu available, you must ensure that there are no Declares (owned element) relationship connectors in the selected elements in a diagram. You can either manually de-select these owned relationship connectors, excluding Java packages and their contained types, or use Filters > Show/Hide Relationships to filter out owned relationships from the diagram or, if you want to to harvest all elements in the diagram, use Select > All Shapes. When you selection does not contain any owned relationship connector, the Harvest context menu will be available.
Performing a "Save As" operation on a .dnx file opened from a CVS repository in the CVS repository view will result in an error and the file will not be saved. If modifications need to be made to a particular revision, you should check out that revision and then make changes to it.