The pros are credited to the facility the moment you check out — that's the only pros on the whole transaction. When you sell, the price you enter is exactly what you owe the company.
Unsold product goes back on that facility's shelf and its pros credit is reversed.
Pros were paid to the facility at checkout — the price here is exactly what you owe the company.
You pay the company directly for what you've sold — the facilities you pulled product from are never billed for your sales.