First off, this should be asked on the user forum, as this forum is for discussing the design of jBPM, not how to use it.
Secon, before you post, you should try to describe what you want to do in a clearer manner, and provide examples of the process definition and your rules. In particular, it is not clear how your rules would get invoked, in order to determine if the value was greater than 10.
Finally there are example of jbpm / rules integration in the jBPM 3.2 examples directory. You should look at them if you have not already done so.