Good point! Never underestimate your opponent. Milan went into the match confident of beating Bologna again, as the league had ended 3-1 to the Rossoneri.
But Bologna changed strategy in the Italian cup and it worked great.
But frankly I don't like to talk about Milan having the wrong approach to the match, rather one should extol the feat done by Bologna
Learning from Milan's losses over Bologna never underestimate the opponent team faced although have lower position standings or leaded head to head before. But Milan over confidence for defeating Bologna after success eliminating Inter at semifinal round and expect will easily for beating Bologna to win Copa Italia.
In the games fact, Bologna more dominance than Milan by creating many attempt or shots on target although Milan leaded ball possession only, sadly Milan failed get Europe League ticket next season trough Copa Italia after small chance trough domestic league top standings position.