Invoice to PO matching - Understanding PO Lines section of the matching screen

PO lines (Key fields are highlighted in bold)

Field Name		Function
Item No		The order of lines on the PO.
Purchases Account		Purchases or Nominal account to which the PO line is assigned. When an invoice line is matched to this Po line, this is the purchases / nominal account that the invoice line will also be assigned to.
You		When an invoice line is split over more than one cost centre, this field indicates to the approver that this is the line they need to approve.
Alternate Cost Centre		Cost centre to which the line is assigned to.
Product Details		Product/service line Code and Description
Quantity		Ordered Quantity
Item Price		Price per item
Export & Allocated		This field shows how much of the PO line has already been allocated to an invoice line on another invoice. This amount has already been approved and therefore is committed.
Auto & Manual Committed		This shows the value of the PO that has been assigned to other invoices that are still awaiting full approval. When this invoice is approved, if it fulfills the PO or uses some of the available balance that has been auto assigned to another invoice that is still in the queue for approval, those other invoice reviews will be recalculated after this invoice has been approved.
This Session Additions		Shows what value of the PO has been assigned to invoice lines during this invoice approval review.
Outstanding		Displays how much of the total value of the line is still available to be assigned to invoices.