an Entity references as follows:
The 1990–91 Bundesliga was the 28th season of the Bundesliga, the premier football league in West Germany. It began on 8 August 1990 and ended on 15 June 1991. FC Bayern Munich were the defending champions. With the Reunification of Germany on 3 October 1990, it was the last season that the league was exclusive to teams from the former West Germany before it was opened to teams from the former East Germany.