Requisition process

Hello

I have a question. We are going to use Core purchasing and form requisitions (not iproc).

We are in 12.1.3.

The requirement is to use requisitions but only for some departments. Let's say IT department needs to create requisitions with a specific approval hierarchy, and others department not.

The others can create directly a PO without a requisition.

All department need to use PO, IT has to autocreate the po from the requisition and the rest of the company just create a manual PO.

Is that possible?