To verify, you added CR Type in PM and not appearing in the dropdown, I suggest you to check in
by opening workflow browser in Configure Rule-based Workflow under Workflow (PM). look for your CR type in F4 there.
If you still don't see your CR Type in F4, then probably you may not attached relevant business activity like for ex: MAT1 (this is for create material) in your PM. if possible, post your PM screenshot where you added CR Type.
Thanks
Praveen
