Purchase order determination

Question

Dear Gurus,
Kindly let me know the process of how the system automatically determines the purchase order during Transfer in shipment cost seetlement transaction.
If we have multiple POs, then how system identify which PO to pick.
During maintaining of purchase data for transportation planning point, we maintain only few things, then how does system identify a particular PO.
Any help is appreciated.
Thanks.

Answer 1

Purchaser Activities
       1.      Choose Process Purchase Orders.
       2.      To create purchase orders manually (without a preceding document), choose Create.
                            a.      The system opens a new document in the change mode.
                            b.      You add any missing entries at header and item level.
       3.      To process an existing purchase order, you have the following options:
¡        In the worklist, choose the number of the purchase order you wish to look at.
¡        Use the search and choose the document from the search results.
       4.      In order to process header and item data, choose Change.
For example, you can use  in the partner overview to transfer the preferred vendor to the purchase order.
       5.      Choose Check to determine whether entries still have to be made or changed in the purchase order.
A list shows any missing or incorrect entries.
       6.      In order to transfer the document to the vendor, choose Order.
                            a.      The system generates an output action.
                            b.      The system processes the output action and sends the document using a scheduled output report
You can read more at
http://help.sap.com/saphelp_srm30/helpdata/en/38/4cc5376848616ae10000009b38f889/content.htm
Hope this helps, Thanks