Bamboo artifacts don't get collected if they are located into directories

I created a file called "as.zip" located in directory "a" which is located in directory "test".
I used "test/a" as Location, and I used "*.zip" as Copy Pattern - the same way as it is described in [this document|http://confluence.atlassian.com/display/BAMBOO40/Configuring+a+job%27s+build+artifacts].