Hi Josip,
It is advised to work with the support team they know how to recover this, however for your knowledge or reference you can try out the below:
Login to the knowledge.hitachivantara.com
There you search a knowledge article with the title "How to Recover From Ref Code 628000 DP Protect Attribute Setting of DRU", if this article is visible to you it means customer can follow the steps mentioned in the article, if not then customers are not allowed to follow the steps, then only way is create a support ticket.
Note: If knowledge article is visible to you and you are sure about all the steps then you can perform yourself otherwise please engage the support team.
Thanks
Prasenjit
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Prasenjit Chatterjee
Hitachi Vantara
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