When a logical file is copied into another library, two cases determine the basing for the file:
1. If both the logical file and its based-on physical file are originally in the same library, a duplicate of the physical file must be created in the new library before a duplicate of the logical file is created. After these two duplicates are created, the new logical file is based on the new physical file.
2. If the logical file and its based-on physical file are originally in different libraries, it is not necessary to duplicate the physical file before duplicating the logical file. In this case, the duplicated logical file is based on the same physical file as was the original logical file. Unlike the first case, even if the physical file is copied into the new library before the logical file is copied, the duplicated logical file is based on the original physical file, not on the duplicated physical file.
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