Exclude URL [newbie]

Hi,
I'm trying to set up a rule to move all .webloc files from the desktop to a folder in my ~/Documents. But I don't want it to happen with weblocs I've created from MacUpdate. I've tried adding a condition: "Source URL/Address does not contain macupdate"; but Hazel still seems to send them to the folder. What am I doing wrong?
Thanks.
I'm trying to set up a rule to move all .webloc files from the desktop to a folder in my ~/Documents. But I don't want it to happen with weblocs I've created from MacUpdate. I've tried adding a condition: "Source URL/Address does not contain macupdate"; but Hazel still seems to send them to the folder. What am I doing wrong?
Thanks.