In reply to G4OBK:
Hello Phil,
this is only my personal opinion and might not be in accordance with the MT.
Cited from the SOTA-General-Rules:
“Where the mountain peak has been issued a reference number in two or more Associations, the Activator may claim points each Association provided that the Operating Position is always within the jurisdiction of the appropriate Association. Unless the licensing regulations decree otherwise, the position of the Operator is deemed to be the Operating Position.”
In combination with the given definition of the operating position, which clarifies that the precise location of the used transmitter and not the position of the activator is the crucial factor (Whatever the “precise” location of a transmitter is), there seems to be some conflicting statements.
A solomonic decision would be to count only half of the points for each of the summits 
At the border region between Germany and Austria, I think, it is quiet clear. Depending on the prefix of the call sign you are using, i.e. either DL/ or OE/, it is clear whether you are operating on the german or on the austrian side of the border, therefore it would be not possible to activate two SOTA-references in one QSO.
I’ve seen you’ve spent a lot of effort changing your operating position while you activated two (or better four) summits on the Karwendel Klettersteig this summer. By the way, brilliant photos and a very nice trip report on your blog.
I decided for myself, that I don’t want to agonise which such a question. I’m just activating each border summit once, i.e. with only one reference. Therefore I “lost” about 120 activators points this year only. But I don’t worry about this. I enjoyed each summit, that’s my main reason for climbing up the summits.
I did quite the opposite of a double activation yesterday: After descending, when I arrived at the car park, I realised that I lost my antenna mast somewhere on the way down from the summit. Despite of the upcoming dawn, I decided to climb up the mountain again. And after nearly 700 meter elevation gain I found my antenna mast sticking in the snow not far away from the summit. In summation climbing up about 1400 meters for just 6 points.
Thanks for the contact yesterday.
Merry Christmas
73 Stephan, DM1LE