Activiti: potentialStarter method not work

[jolo_]

I defined my process like:

<process id="myProcess"
             name="My process"
             isExecutable="true"
             activiti:candidateStarterUsers="MANAGER"
             activiti:candidateStarterGroups="MANAGER">
….
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Problem:
The groups and users lists are empty after:

List<Group> groups = identityService.createGroupQuery().potentialStarter("myProcess").list();
List<User> users = identityService.createUserQuery().potentialStarter("myProcess").list();
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No matter I proceed those queries bofore or after process start.

Question:
What the reason?

P.S.
I've added "MANAGER" to act_id_user, act_id_group, act_id_membership

[jbarrez]

.potentialStarter takes in the DB id of the process definition, not the process xml id.