Problem
Users report that sub-items are visible in the "All Data" (List/Table) view but are missing or invisible when viewing the "Parent Card" view. This usually indicates a synchronization error between the data entry and the UI's display layer.
Solution
The link between the parent and child records has become "stale" in the database index. While the data exists, the Card View's specific filter or grouping logic fails to fetch the sub-item.
The most effective fix is to force the system to rebuild the relationship by toggling the sub-item's association.
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Locate the Sub-item: Go to the All Data view where the sub-item is currently visible.
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Disconnect: Edit the sub-item to remove its current association. You can do this by:
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Moving the sub-item to a different parent item temporarily.
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Setting the sub-item as a standalone item (removing the parent field value).
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Refresh the page
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Reconnect: Re-add the sub-item to the correct Parent Item. This action forces the database to refresh the index for that specific relationship.
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Verify: Return to the Card View. Confirm that the sub-item is now visible under the parent card.