Voratsdatenspeicherung has nothing to do with the secret services. It is a tool for the police they can access with a warrant. The BND is not complaining that this is currently ruled unconstitutional, they are simply not affected.
I apologise for the wrong wording. I merely meant to say they are in the same category, i.e. collecting data on 'everyone' and only making use of it later.
But at least it's not under the blanket term of "terrorism" :)