What is the Round when the series shows 5th place, and a Season of 2006–07?
CREATE TABLE "2000s_incorporation" (
  "season" text,
  "competition" text,
  "round" text,
  "opponent" text,
  "series" text
);
SELECT "round" FROM "2000s_incorporation" WHERE "series"='5th place' AND "season"='2006–07';