Column headings stop repeating on subsequent pages when sub report is added

I have two separate reports that I have designed where, just by adding a sub report, the option to repeat column headings on each page then fails.In both cases, before adding the sub report, the report displays properly with the column headings repeating on each new page. Once the sub report has been added the column headings no longer repeat.On one of the reports, there is a parent group and the other report there is no parent group. There has to be a simple solution to this that I haven't seen yet, right?Any help would be greatly appreciated!