Drop Shipment and Charge (Item)

I have the following situation:

Sales Order with 2 lines

  • “Item” Line

  • Charge (Item) Line. Assigned to the Item Line on the Sales Order

Purchase Order

  • “Item” Line

  • “Charge (Item)” Line. This Line is assigned to the Item Line of the Purchase Order.

The Sales Order and Purchase Order are related with Drop Shipment functionality. When I Post the Purchase Order (Recieve), the Item Line and “Charge (Item)” Line are correct posted. Also the Item Line on the related Sales Order is totaly shipped. But, the “Charge (Item)” Line on the Sales Order not!!

How can this be? I assign the line to the Item Line.