When you copy a session, the Copy Wizard verifies that the associated mapping exists in the target folder. If the mapping does not exist, you can choose a different mapping from the target folder.

To find available mappings in the target folder, click Browse. If the target folder does not have any mapping in it, the Copy Wizard prompts you to create one:

You must cancel the copy process to create a mapping. When you cancel, the Copy Wizard does not copy any object. To avoid this problem you can copy the mapping to the target folder in the Designer before copying the session. If you replace a mapping with an invalid mapping, the associated sessions become invalid.