Not all European space sector companies are compliant with ECSS, which of course means that most of their clients are private/outside-EU. Also, some companies are only partially compliant with ECSS, so this is a very important question, which cannot be only limited to confirmation of the existence of this system.
The question about ECSS is valid, because Russian/Estonian entities are not required (yet or at all) to use ECSS. So have you done any training on this topic? Was it somewhere at ESA premises?