My company hired Ernst & Young to help with this.  We created an account called "Invoices to Come" to deal with this.  When goods are received, a Bill is created by the Receiving team that Increases Inventory (by Product, linked to a PO) and a corresponding amount is entered within the same Bill to "Invoices to Come" so the Bill shows as a $0 Bill.  *Note that everything in a Bill represents a debit since the credit is A/P, so you have to enter a negative "Invoices to Come" (negative debit = a credit) amount to offset the Inventory.  The increase to Inventory and increase to Invoices to Come in the Bill net out to a zero dollar Bill so A/P is not affected.  We record this with a Bill # that starts with GR so we know it's a Goods Received Bill vs a real Bill.  So Inventory is debited and a liability is credited as it should, just not A/P.  When we receive the real Bill, we enter a new Bill as usual, but use "Invoices to Come" (positive amount entered this time) to offset it.  So it'll debit Invoices to Come and credit A/P.