the message is there because one anger is designed, therefore the loadcases should be:


W+H - HGR -rigid
W+T1+P1+H - HGR -ignore
WW+HP+H - HYD - rigid
W+T1+P1+H - OPE - As Designed
W+P1+H - SUS - As Designed

if you do not indicate the cold or hot load for a hanger, then the load cases are:

W - HGR -rigid
W+T1+P1 - HGR -ignore
WW+HP+H - HYD - rigid
W+T1+P1+H - OPE - As Designed
W+P1+H - SUS - As Designed


For a practical approach I use always the first set of loads, with H included in the first two load cases even I do not define a hanger. There is no problem, Caesar will try to include a H load and will not include if not present. (same if you do not input a displacement but your loadcase have D1 included - if not find then ignore). This is because this way I do not have to change the load cases if I define or I change my mind and I do not define a hanger)

W+H - HGR -rigid
W+T1+P1+H - HGR -ignore