shall apply to any and all contracts whether in existence at the time of execution of this agreement or entered into subsequently thereto, and even in the event that our terms and conditions contradict a buyer's order

AWWDI ;-)

This applies to current and to all future contractual relationships, even if our general Terms and Conditions conflict with those of a buyer's order

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A waste of paper and ink, just don't accept the order

And what is meant by 'applies to current contractual relationships' ? What will current Gegenparteien have to say about this?