Hi Edson, I added the JIRA ticket below regarding the bug with the nested prefixAnd/Or expressions https://jira.jboss.org/jira/browse/JBRULES-2414 as a subticket to a similar issue described here https://jira.jboss.org/jira/browse/JBRULES-2383 Thank you! Nelson ------------------------------ Message: 4 Date: Tue, 19 Jan 2010 17:01:41 -0500 From: Edson Tirelli <ed.tirelli(a)gmail.com&gt; Subject: Re: [rules-users] rules-users Digest, Vol 38, Issue 58 To: Rules Users List <rules-users(a)lists.jboss.org&gt; Message-ID: <e6dd5ba31001191401r67ddf877o7e9619ba0d23b281(a)mail.gmail.com&gt; Content-Type: text/plain; charset="iso-8859-1" Yes, the good news is that it is clearly a parsing error, what makes it easy to fix. Do you mind opening a JIRA and attaching a test case or the info from your e-mails? Thanks, Edson