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These procedures are called during migration of V7.3.x to V8.0.2 using the export/import utilities: the import utility will call it
They are private functions to be released in PL/SQL binary form and are shared by a snapshot and master partitions.
Why they are still hanging around in version 20c is a total mystery given that every other piece of Advanced Replication has been dropped from the product.
Owned by SYS with EXECUTE granted to the IMP_FULL_DATABASE role