When a grouped report with a header or footer is generated with equal number of rows per page; it might create some orphan rows. Please see the following screenshot:
As you can see the totals for Camping Equipment has gone on the next page and looks like an orphan. In this recipe, we will see how to solve such issues of orphan rows.
As you can see in the last screenshot, Cognos now moved 5 rows on the next page to connect to the Camping Equipment totals.
The property Keep with footer specifies how many rows need to be with footer so that it doesn't hang out as an orphan. This setting will take precedence over the Rows per Page.