- 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 is deleted; if only the second dimension point (RPOI element) is inaccessible, then only that dimension point is deleted, leaving the PDIM and its centre point still defined.