SL-IndirectPathAddChange-r18

SL-IndirectPathAddChange-r18 ::= SEQUENCE {
    sl-IndirectPathRelayUE-Identity-r18       SL-SourceIdentity-r17,
    sl-IndirectPathCellIdentity-r18           CellIdentity,
    t421-r18                                  ENUMERATED {ms50, ms100, ms150, ms200, ms500, ms1000, ms2000, ms10000} OPTIONAL, -- Need M

    ...
}