Why are not all related records displayed?
As shown below, a project is actually related with 5 tasks, but only 2 related tasks are displayed, with a prompt indicating that 3 task records are hidden.
This is due to the following setting:
When setting the related task field in the project worksheet, the option to select task records from a specific view (e.g., "In Progress") in the task worksheet was checked. If a task record is related and later its status is updated to "Completed", it will no longer appear in the "In Progress" view. As a result, the task is hidden, but the relationship still exists,it is simply not displayed in the user interface.
If you need to display all related records, simply uncheck the option "Filter the displayed results".