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After you create a mapping, you can edit it by adding, modifying, or deleting objects. Objects include source definitions, target definitions, mapplets, and transformations. Before the Designer deletes objects in the mapping, it displays the list of objects to delete. The Designer displays a validation message in the Output window when you save a mapping.
To see what sessions or shortcuts may be affected by changes you make to a mapping, select the mapping in the Navigator, right-click, and select View Dependencies. Or, click Mappings > View Dependencies.