I have a 1:N relationship configured between a Custom entity and Opportunity respectively. by default, it is a referential relationship between these two entities. What I would like to do is to make it a Configurable Cascading so that I can edit the behaviours on the Share and Delete aspects, specificaly. Now, upon clicking on the Save button after changing these behaviours, I get this error

Now, I do not know what kind of sin I am commiting to get this error, but as it says there is already another relationship, I just cannot find the refered relationship from the error.
How can I achieve making or creating a Configurable Cascading relationshp and actually edit its behviours?
Thanks in Advance.
Victor.
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