How delete a routed Net completely

Hi,

I want to delete a routed net completely. I have made appropriate options in find filter ON - Vias & Clines & Nets - and selected them in Delete Net Options as well. As depicted below net is selected whenever I click on it but it is not deleted. I receive below message:

No element found.

https://drive.google.com/file/d/0BzS3_lT7y4tET0xFSGNpZHBjWkU/edit?usp=sharing

I should add that if I deselect Nets item it works only for every pin.

Thanks in advance,

Hossein