PtrUpdate validates and establishes the pointers which maintain logical relationships. It connects logical children to their logical parents and matches paired logical children to each other. If logical child segments are loaded to a database, a PtrUpdate is required before making any calls to the database. A PtrUpdate is run after loading the physical databases containing the logical children and their logical parents.
When running IMSBDU from the command line, the function-id to use for the PtrUpdate function is PTRU.