The AP PO Match form sorted numerically but doesn't anymore.

Note R12:AP: Match to PO Form Does Not Sort The Line Number Correctly, and the Received Field Left Justifies. (Doc ID 2593612.1)  includes the following explanation

The Purchasing application uses numeric Line numbers, but the Contract Lifecycle Management (CLM) application uses alphanumeric line numbers.
CLM uses the same Match to PO form, so the Line number column has to handle letters as well as numbers.   It has to work for both applications.

The patch 17529626:R12.AP.C  makes the Match to PO form sort numerically, but then users of CLM got errors.
Another patch 27423997:R12.AP.C  was created to make the Match to PO form sort alphabetically, and this is the correct way the form should work.