How to Track Who Create the PR by Manually Run MRP

Hi Expert,

Recently my client told me that he found some PR generated unexpectedly by system. I highly suspect that the new PR is generated by the someone else MRP run and the old PR is often replaced by the new one and it's impossible to find the User ID who actaually run MRP and created this PR. So what I am trying to do is to find out the action log and figure out who run MRP. Who can support me on this? Many thanks indeed!