In regards to migrating a V4R5 system to a V5R1 system, it is best to use the previous release to current release restore/migration instructions, which can be found in Chapter 15 of the Backup and Recovery book.
All saves from the V4R5 system should be performed with *CURRENT release support. This is because they will be RESTORING on a higher release. Issues arise when you want to save data from a higher release and restore it to a previous release.
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