In Dynamics NAV 5.0SP1, the caption for Your Reference has been changed to Customer PO No. For us, we've always used External Document No. to store the Customer PO No. on the sales order.
It's obvious that the change in 5.0 SP1 was done due to partner requests. I just want to get your opinion on where you put the Customer PO No. when entering a sales order. Please vote here:http://dynamicsuser.net/forums/t/23238.aspx
Hmm... based on the poll, there seems to be a lot of users out there using Your Reference.
It should go into the "External Document No." field. It must be some sort of (mis)understanding by customer support people at MSFT to give the field the new caption. I would personally change the caption back in my standard customer database.