EXTERNAL OPERATION in a production order with different company code plant
in my case i am having a production order with 4 operations.
among this opearion 0030 i want to do it in a plant which is assigned to different company code than mine.
in this case whether i should proceed with PP01 Control key with opearion plant as that plant which is lieing in diffent company code or
i should specify PP02 control key saying that plant as an external vendor for me and do PR and PO for that service .
which should i follow for my case and how cost gets updated .