[jbpm-users] How to integrate permissions in jbpm5 and permissions module in my business system

HI, In my business system ,there's the permission module , include own user table and role table in my database. I need config my business user id to the value of 【ActorId】property in【user task】node . but in jbpm5 There is a foreign key association with【TASK】 table and 【ORGANIZATIONALENTITY】 table. so need to repeat to store business users data in the JBPM user table. But I do not want to do this. How to integrate permissions in jbpm5 and permissions module in my business system. this is my other thinking: assign default jbpm user such as 'john' to 'ActorId' propery value to execute jbpm task,at the same time use the other property such as 'Business ActorId' to save the business user , and add a new todolist table to save the relation with task and my business user . what's the best way?