When an order is placed and stock has been allocated. If you come back to view an order and the previous stock location is no longer linked to the product, you cannot see how stock was allocated. This know does the stock showing on the order item line as normal, and then also checks if order line meta for any meta stock allocations which used to exist but no longer valid.
Real world example: customer placed order, 4 weeks alter they returned it and owner has gone to check which warehouse the items need to go back to, but the item was removed from warehouse 2, so it only told him there half the allocation was from.
When an order is placed and stock has been allocated. If you come back to view an order and the previous stock location is no longer linked to the product, you cannot see how stock was allocated. This know does the stock showing on the order item line as normal, and then also checks if order line meta for any meta stock allocations which used to exist but no longer valid.
Real world example: customer placed order, 4 weeks alter they returned it and owner has gone to check which warehouse the items need to go back to, but the item was removed from warehouse 2, so it only told him there half the allocation was from.