As classify_sibcs()$rsg_or_order names them. A reference label that
is none of these after .SIBCS_LEGACY_ORDER_MAP has no class the key
can return, so normalise_febr_sibcs gives NA for it.
As classify_sibcs()$rsg_or_order names them. A reference label that
is none of these after .SIBCS_LEGACY_ORDER_MAP has no class the key
can return, so normalise_febr_sibcs gives NA for it.