If you end up with gaps in P.O. numbering it’s possible for a user to key a P.O. number in the gap and effectively reset the next P.O. number lower. When this happens, you get P.O. errors. It’s relatively easy to reset the number but it becomes a pain to do it over and over again.
The Professional Service Tools Library (PSTL) offers a Minimum PO/Receipt Number Tool. This sets a number threshold that that users can’t create a P.O. Number below.
Once active, Purchase Order Processing Setup gets an Additional menu to set the minimum threshold.