Historical modification of Purchase Requisition

Hi

I have a rigide procedure to respect, in which, we have to create a new Purchase requisition when we want to modify and existing approved Purchase requisition..

The Idea that I want to purpose to client is to return the Approved requisition  in order to modify it, without need to create a new one but :

A 100% sure that he will ask to get  historical of modification : different version of the Same purchase requisition and details of each one ( Quantities, Price...)

Is is possbile to get the history of modification?

Thanks for assistance & sharing