The Ausbau Abenteuer (Advanced Adventures) series encompasses all adventures that use the Das Schwarze Auge advanced rules (e.g. the skill system).
The difference between basic and advanced rules only existed in the first edition and second edition. Those adventures had a yellow upper right corner in which the adventure number and level requirements were printed.
Later editions merged the rules, so for third and fourth edition adventures, this is the standard series if no other series code is mentioned.