Can someone advise what I should expect regarding what Buyer and Planner information is retrieved when raising a Purchase Req (Part) please?

We have an Inventory Part set up with Planner JBLOGGS, Purchase Part record is set up with Buyer = JBLOGGS yet when I raise a Purchase req line for this part, the Buyer defaults to the User ID (also can’t find where to change default Buyer against User but I’m sure that will come soon!)

Thanks

Linda