Different post-processing/in transit time to the same item

Different post-processing/in transit time to the same item with 2 different forecasts demand.

The planner has a 2 different forecast demands to the same item:

• Local demand, entered with the date the product needs to be ready in stock.
• Exportation demand, entered with the date the product needs to be ready on the port of shipment (15 additional days).

The planner needs to start the production to attend the exportation demand before, because it will need 15 additional days after to the product be available in stock.

If we try to setup a post-processing lead-time to level item, but it does not work because it will affect too the local demand since both demands use the same item and we need to include the additional time only to the exportation demand.