Edwin,
I think I understand your question, and reworded the headline accordingly.
If I follow you, you:
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Went to add a child but didn't know that the child already had a WikiTree profile.
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After submitting the child as a new person the system suggested that the person might already exist.
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You accepted one of the matches.
You're asking, since you accepted the match, why didn't the system automatically set that person as the child.
I agree, that would be a nice feature, if you are on the Trusted List of that other profile, as Becky points out.
Chris