Problem with COGS. Inventory Value zero on Item Card

bbex

Hello..
I've got a problem with the calculation of the COGS.
I've got some different items where the inventory value zero is checked. So when creating a purchase order for this item, it automatically values inventory increases at zero cost. (after running the Adjust cost - item entries batch and Post inventory cost to G/L). So that's ok..

But now when i want to create a sales order for this Item. And after running the two batches he will decrease the inventory and will calculate the COGS of this item. but he has to calculate at zero cost like for the purchase orders.

Maybe i'm doing something wrong or it's bug??
Can someone help me?
Thx