AME repeated approver problem in requisition(R12)

HI everyone:

I have a similar problem.Need some help.(USING 12.2.3)

I make a test,there is a List Creation Exception rules have two Action.First action generate by SQL(bring Purchasing manager).Second action generate by hr position(requiter->purchasing manager->store manager).

I read How Can Repeated Approvers Be Avoided When Using AME For Approving Requisitions (Doc ID 561136.1).And try Once per transaction,Once per group or chain,Once per action type.

In my tests,AME kills the repeated approvers if I use static Approver Groups.

So,it is a bug?