While editing the search cards for our EPDM system I discovered "stacked" checkboxes. These are multiple checkboxes with the same caption prefix placed precisely on top of each other. Each of them appears to have slightly different parameters from the rest, but to the user they appear to be one checkbox.

In this case each of them has a different search variable:

• Content - Search in document body
• Content - Search in properties

I haven't been able to find this documented anywhere. Is it common practice?