I am working on possible ways to create Supplier invoices in openerp.  I know that we have option to create supplier invoices based on incoming shipments.  However, there is a problem when we receive a product which has Bill of Material (phantom BoM).  

Consider following example:  Product X has a Bill of Material of product Y with 10 Qty.  Now, when I order (PO) and receive 1 Qty of X through incoming shipment and create supplier invoice for that, application is creating an invoice with 10 Qty of Y products but price of X.  Which means, instead of 1X price it is creating 10X price in invoice.  

I may be doing wrong with configuration.  Please correct me.