An update to source page {1} has not been reflected in target page {0} because the target page is checked out. Once target ...

An update to source page {1} has not been reflected in target page {0} because the target page is checked out. Once target page {0} is ready to receive content, check that page in.  Click "View Changes" to determine whether the update is relevant for target page {0}; if so, click "Sync from Source" in the ribbon to receive the latest version from the source page.