[rules-users] Stumped by error in rule

After all this time working with Drools 5.0.1, I thought I'd figured out all the ways my syntax could fail, but this one has me stumped. Any help would be appreciated. I have the following rule: rule "RS6051.1.2_" dialect "mvel" when Applicant ( $ApplicantNumber : ApplicantNumber ) not ( ScoreCard (name == "Context test", contextId == $ApplicantNumber) ) then ScoreCard scoreCard = functions.getScoreCardManager().newScoreCard(); scoreCard.setName("Context test"); scoreCard.setContextId($ApplicantNumber); insert(scoreCard); end I'm getting the following error on this rule during compilation: Unable to create Field Extractor for 'ApplicantNumber' : [Rule name='RS6051.1.2_'] org.drools.RuntimeDroolsException: Field/method 'ApplicantNumber' not found for class 'com.wellsfargo.service.provider.sse.decisioning.x2009.Applicant'Unable to build expression for 'consequence': null ' And here is (part of) the Applicant class in question: package com.wellsfargo.service.provider.sse.decisioning.x2009; public class Applicant { public Short getApplicantNumber() { return applicantNumber ; } public void setApplicantNumber(Short applicantNumber) { this.applicantNumber = applicantNumber; } Short applicantNumber; } And This is (part of) the ScoreCard class: public class ScoreCard { public void setName(String name) { this.name = name; } public String getName() { return name; } public int getContextId(){return contextId;} public void setContextId(int id){contextId = id;} private String name; private int contextId; } Why am I getting this error? Help! Thanks Tom Murphy