Problem to delete subnet "100.0.0.0/8"

Problem to delete subnet "100.0.0.0/8"

Hi,
 
In the Discovered Subnets, I got a subnet "100.0.0.0/8". I approved this subnet, but now, I want to delete it. Unlike othet subnets, I cannot delete this one. Is that because it is such a big subnet?
Is there a way to get this "100.0.0.0/8" subnet deleted?
 
Many thanks,
 
Raphael

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