If the user is issuing a group of purchase orders via a printer, this setting will determine the order in which the purchase orders will print.
From the Setup menu, select Divisions.
Or, click on the Divisions icon within the Setup toolbar.
Verify the division currently selected in the Division field is the correct division for which the Purchasing module settings for the division will be defined. If necessary, select a different division from the Division drop-down menu.
Click the 
Purchasing icon within the vertical list of icons on the left.
Under Purchase Order Options, select the sort order to use.
Release Code - If this option is selected, the selected group of purchase orders will print in the order of and/or be grouped by the release code assigned to the purchasing activities in Purchasing Activities.
Supplier - If this option is selected, the selected group of purchase orders will print in the order of and/or be grouped by the short name of the supplier the Purchasing Activities are assigned to.
Click on Save.
Continue with configuring the purchase order options as necessary, or click the Close 
button to exit the screen.
Purchase Order Numbering Options
Purchase Order File Name Format