Hi,
After observing your scenario we can conclude like,
Plant A under company code A is for production or processing and Plant B under company code B is a marketing purpose.
If we do goods movement,there is a possibility of generating FICO Documents. This is because the price of the material is different in each plant.
FICO Document captures these price differences during goods movement.
If you create one more plant C under company code A- implications:
If you opt for this approach, you can avoid inter company transfers.
FICO documents will remain generated if the price of the material is different in plant A and C during goods movement.
Regards,
Pavan Kumar Arvapally