My understanding is that you can still submit and complete a registration without a response, as long as you make sure to meet requirements of data sharing and joint submission. In other words, the completeness check at ECHA may not necessarily fail without a formal inquiry number. This may therefore work in certain cases, such as where there is already a consortium available and this is publicly known. The registrant can then become part of a relevant joint submission and ensure compliance with necessary data-sharing. But I have not (yet) tried this in practice. Any comments are appreciated.
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