Check on this note also : Purchasing Reports Fail When Changing Output To XML REP-0002 REP-271504897 REP-57054 (Doc ID 1452608.1)
If you cant reproduce the issue on other instance, apply the patch on the test instance and verify all the funcionality related to the patch works OK. Then move the patch to production. Or you can clone the prod environment to test the patch.
Follow the solution given in MOS note: DESFORMAT=XML Fails With REP-271504897 With Long Column and Long Data (Doc ID 843678.1)
if you are not convinced, raise SR to Oracle Support and get guidance.