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Traversing from execution to root process instance

Question asked by gokceng1 on May 15, 2013
Latest reply on May 21, 2013 by jbarrez
I have some nested processes via call activities.
I need to find root(top most) process instance or execution using a given execution. I've looked at the ACT_RU_EXECUTION, there are some entries with SUPER_EXEC_ not null and there are some entries with PARENT_ID_ not null. I'm not sure about what is the difference between them. Also I don't know whether they can be both not null. As I see, starting execution's SUPER_EXEC_ and PARENT_ID_ values are both null. But checking SUPER_EXEC_ nullity and if it is null checking PARENT_ID_ nullity seems hacky to me, is this the correct approach?