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If you want to simply void all existing learning records for a single course, you should follow the procedure explained in Voiding All Learning Records in a Course.
If you want to change everyone's expiration date for a single course to the same date, you should follow the procedure explained in Expiring Learning Records.
If your scenario is more complex (e.g. multiple courses, selecting specific learning records, specifying different expiry dates for different people), you will need to follow the step-by-step instructions in this article.
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