Deleting a Product with AIF

Hi,

I have enabled the "delete" service operation for the InventItemService, refreshed my services and re-activated the Inbound Port but when I try to delete a product by calling it in code, I get the following error: 

The Axd document does not support this action.

I'm using AX 2012. Just a note, I have the create service operation active on the same port and that works fine.