Purchasing approval Hierarchy

Hi Oracle Gurus,

I have a question on purchasing approval hierarchy using employee-supervisor setup.

Here is the scenario:

A purchase requisition was created and was submitted for approval without putting a 'Forward-to' person - it directly went to the creator's supervisor.

The supervisor forwarded the requisition to a person belonging to another department with different hierarchy. 

Then that person from another department approved the requisition but it is not within his approval limit.

My question is - what approval hierarchy will the requisition follow? To the creator's approval hierarchy or  to the hierarchy of the person who approved it?

Thanks.