Hi there and thanks for your reply.
IMHO, since I don't know your system design, and supposing you have a one-to-many relationship between Book and Series entities, have you consider this relationship becomes a many-to-many relationhip (with the series index in the relationship itself)? Maybe with this approach, the problem would be solved.
Of course, consecuences in whole system should be analyzed.
Again, it is just an idea.
Regards
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