Dependency build between programs on IBM i

During a dependency build we observed that also dependent programs, and not only programs dependent on changed files, are recompiled.
I'll try to expalin better with an example: we have a CLP which calls an RPG program; the CLP has been changed while the RPG has not been changed.
During the dependency build both the programs are recompiled.
Is this an expected behaviour? Is there a way to exclude programs from a dependency build (in the example the RPG might be excluded)?

Thanks
Laura