If the print of a table is continued on the following page, the header lines of this table and the outer table will be printed again. To suppress repeated printing of the header lines on the following page, use the FirstHeaderThisTable() function as an appearance condition.
This functionality is also available for footer lines, here you use the LastFooterThisTable() function as the appearance condition. This ensures that footer lines are only output on the last page of the table in the event that the print is continued on the following page due to lack of space.
You will find more information about this in the chapter Overview of Functions.