I created a purchase order with some in-stock items in addition to some advertisement items. The advertisements were assigned a specific price on the purchase order.

When creating the vendor bill, I put the landed cost product on the invoice lines and set the price of the advertisement item to 0 since I don't want any landed cost associated with it.

But, I was surprised that the landed cost was assigned even though the price was 0.

In another case, I set the price to 0 for the advertisement product, and subsequently, it didn't take any landed cost on it.

How to fix the issue? for the first case