You can't suprress a group header using some value that emerges or is calculated while the detail lines are being printed. This applies to running totals. Summary ttoals are based directly on the data and you can use them to modify or suppress the header, as lupins46 said.
It helps to give your Crystal version, since newer versions have extra solutions, and some extra problems. I use Crystal 8.5
Madawc Williams (East Anglia)