How can i differentiate b/w "FORWARD and "APPROVE FORWARD"

Hi,

I would like to know in oracle Purchasing there is notification page where employee can find the relevant purchase order which waiting for some action, when multiple people perform some action on a particular purchase order then i store the history in po_action_history and po_action_history_v. The thing which i want to know is that when a person press forward button it store the value forward in the related table and when press approve button then it store approve but when some one press forward approve then i can only find forward value at this stage how can i differentiate that