System Administration -> Control File Maintenance Menu -> System Parameters Menu -> Define Site Control Parameters (LG0144) -> Select the 'Req/Purch' button (LG0542)
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Set the 'Next Year PO Key' and the 'Next Year Req Key' box to 'Next Year Only'
Note: Make sure to log out completely and then log back in again in order for the system to pick up this change.
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