As the error seems to be related to workflows and the ability to clone, I can think of the following possible causes, depending on the action which triggered the error:
Reviewing the underlying workflow in edit mode may provide a clue.
If you do not find anything else, I'd suggest you to create a ticket with Atlassian Support:
Do you have Edit Issues permission in RMD project?
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Thank you very much, your recommendation about a post-funktion was helpful! I resolved the problem.
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Glad to know! 😀
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We likely will need more info here in order to assist. Can you clone any issue in the RMD project? It appears the issue is with a custom field. Can you provide more info about this field? What type of field, value?
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