[rules-users] Reusing function definitions in rules

Hi, I am trying to create a centralized drl file for all my functions which I can then use across other drl packages. It this possible? I am getting compilation errors stating that: the method "function name" is undefined for the type "my rule name". When I place the function definition in the same drl as the rule I am using it in, things compile fine. Am I maybe missing some function import statement? Thanks HC