Warehouse Receipt Posting Date

Microsoft Dynamics NAV 2009 R2

Version US Dynamics NAV 6.0 SP1 (6.00.33046)

In an unmodified database, CRONUS USA, I’ve set SILVER Location as;

Require Receive = True

Require Put-away = False

Bin Mandatory = True

I enter a purchase order with a Posting Date of 11/1/11.  I create a Warehouse Receipt, with a posting date of 11/2/11.  I post the Warehouse Receipt (in this case a partial receipt).  Afterwards, I notice that Posting Date of my PO is changed automatically to 11/2/11.  I also see that the resulting Item Ledger Entry is posted with a posting date of 11/2/11.  Up to this point I agree with this behavior.

I realize later that product was also received on 11/1/11 that was not yet posted to NAV.  I again create a Warehouse Receipt, this time with a Posting Date of 11/1/11.  I post my receipt.  This time, all records created from that event have a posting date of 11/2/11 except for the Posted Whse. Receipt (which is 11/1/11).  Even the Item Ledger Entry has a Posting Date of 11/2/11.

Am I missing something?  It appears that when posting partial receipts, one would need to first confirm the posting date on the purchase order before creating and posting a warehouse receipt?  Am I missing something?