[rules-users] No accumulator function found for identifier

Hi, when I create my own accumulate function, I add it to src/main/java/META-INF/drools.packagebuilder.conf and it works fine. However, eclipse is showing one error: No accumulator function found for identifier: ... I've found this http://lists.jboss.org/pipermail/rules-users/2007-December/004349.html and tried to move META-INF to the root dir, but then my app doesn't work (and eclipse shows the same error). Any thoughts? Thanks, Jarek