Hi,
For this you need to have a centralized Purchasing organization.
Which is having assignment with all –plants for all your company code
Note: there are other implications in case of FI, raising a PO you can rise for all the plants for different company codes for a centralized purchasing Org.
But for other implications it’s not recommended to raise a PO for different company codes of a plants
Hope this is help full to you.
Rgds,