Can we allow an Employee to submit a referral if the candidate profile already exist in ORC?

Summary:

Can we allow an Employee to submit a referral if the candidate profile already exist in ORC?

Content (please ensure you mask any confidential information):

We want to allow Employees to submit a referral on the candidates who already exist in ORC. Is it possible?

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Code Snippet (add any code snippets that support your topic, if applicable):