Parma came from behind to beat Odense 2-1 and take pole position in Group D.
Danish side Odense had knocked Hertha Berlin out of the Uefa Cup in the previous round, and they were quickly into their stride as Esben Hansen struck after seven minutes.
Daniele Dessena (41) headed Parma level after 41 minutes, before Igor Budan completed the turnaround (51).
Osasuna were held to a 0-0 draw by Heerenveen in the group's second game of the day.
Heerenveen's Lasse Nilsson was sent off for a second bookable offence four minutes from time, but Heerenveen held on for a draw.
Click below for individual match summaries: