one way
create 2 'flag' formulas to count the records rows meeting each condition of the SRU I and SRU III condition.
e.g
//flag1
if table.field ='SRU I' then 1
//flag3
if table.field ='SRU III' then 1
Sum each of these flags at the group level
sum(@flag1,table.groupfield)
Sum(@flag3,table.groupfield)
Use these two group results in the group footer suppress formula to make it do what you want
example:
NOT(sum(@flag1,table.groupfield)>0 and Sum(@flag3,table.groupfield)>0)