- deletes all RDIM, DPPT, DPBA and APPT elements with DDNM set to NULREF. For PDIMs, if the first dimension point (RPPT element) is inaccessible, then the entire PDIM will be deleted; if only the second dimension point (RPOI element) is inaccessible, then only that dimension point will be deleted, leaving the PDIM and its centre point still defined.