Heristic scenarios

Hi,

This question is about the location and Network Heuristics.

I understand that in both the Location and network heuristics, a location specific product is planned. The difference being receipts are created at the destination location(without demand in source) in Location heuristics but the network heuristics creates both receipt and destination and demand at source.

Can somebody please give examples of what kinds of products need to be planned for both receipts at destination and demand at source?

Thanks.