Restrict a learner from re-enrolling to the course if he already has initial completion record

Summary:

Is there a way to restrict a learner from enrolling to the course again if he has already completed the course in the initial assignment? This is to prevent from having double entry of assignments especially the course is not recurring.

Content (please ensure you mask any confidential information):

In the below example, learner already has a "bypass completed" record, but we wanted to restrict the learner from enrolling again for him/her not to have the Voluntary (self-enrollment) assignment anymore.

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