From version X-Train 3.4.19.4 there is a way to monitor Skills to ensure the material is up to date.
Options to monitor skills
Material Changed - column to be set when the related Material (e.g. SOP version) is reset to draft, or otherwise state changed.
Material New Version - column to be set when the related new Material version is published.
Material Missing - column to be set when the related Material is archived.
Skills > Published
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