What is the engine for the bmw motorsport entrant with 123 points before 2004?
CREATE TABLE "complete_american_le_mans_series_results" (
  "year" real,
  "entrant" text,
  "class" text,
  "chassis" text,
  "engine" text,
  "tyres" text,
  "rank" text,
  "points" real
);
SELECT "engine" FROM "complete_american_le_mans_series_results" WHERE "year"<2004 AND "entrant"='bmw motorsport' AND "points"=123;