NEW.target OR OLD.hold_type <> NEW.hold_type) THEN UPDATE reporter.hold_request_record SET target = NEW.target, hold_type = NEW.hold_type, bib_record = CASE WHEN NEW.hold_type = 'T' THEN NEW.target WHEN NEW.hold_type = 'I' THEN (SELECT ssub.record_entry FROM serial.subscription ssub JOIN serial.issuance si ON (si.subscription = ssub.id) WHERE si.id = NEW.target) WHEN NEW.hold_type = 'V' THEN (SELECT cn.record FROM asset.call_number cn WHERE cn.id = NEW.target) WHEN NEW.hold_type IN ('C','R','F') THEN (SELECT cn.record FROM asset.call_number cn JOIN asset.copy cp ON (cn.id = cp.call_number) WHERE cp.id = NEW.target) WHEN NEW.hold_type = 'M' THEN (SELECT mr.master_record FROM metabib.metarecord mr WHERE mr.id = NEW.target) WHEN NEW.hold_type = 'P' THEN (SELECT bmp.record FROM biblio.monograph_part bmp WHERE bmp.id = NEW.target) END WHERE id = NEW.id; END IF; RETURN NEW; END;]]>