Done a little test using 3 approachs (with new BigDecimal(-12.321)), all are working: rule "test big decimal 1" when Pojo(bigDecimal < 0.0) then System.out.println("test big decimal 1"); end rule "test big decimal 2" when Pojo(bigDecimal.doubleValue < 0.0) then System.out.println("test big decimal 2"); end rule "test big decimal 3" when Pojo(bigDecimalValue < 0.0) // with then System.out.println("test big decimal 3"); end with a wrapper method for the 3rd rule : public Double getBigDecimalValue() { if (bigDecimal == null) { return null; } else { return bigDecimal.doubleValue(); } } Your problem come from somewhere else (other conditions, wrong number in your object, missing import, too old version ...) ----- Mail original ----- De: "devan vanreenen" <devan.vanreenen(a)gmail.com&gt; À: rules-users(a)lists.jboss.org Envoyé: Dimanche 10 Juin 2012 19:38:42 Objet: [rules-users] BigDecimal comparison Hi there, Please assist. I have an object MaxCap that has a single property capAmount of type BigDecimal. The BigDecimal is negative when the rule is MaxCap( capAmount.doubleValue < 0.00 ) it doesnt fire, which I expect it should but when the rule is MaxCap( capAmount.doubleValue > 0.00 ) then the rules fires, so the rule recognises my negative number as a positive one. Any help would be appreciated. Thanks Devan -- View this message in context: http://drools.46999.n3.nabble.com/BigDecimal-comparison-tp4017841.html Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users