[rules-users] DRL - Accessors that take arguments

Hi, I am fairly new to Drools and am just getting my feet wet with writing rules. In my work, I have to integrate drools with classes that do not expose all properties via getXXX/ isXXX accessor methods but require a call of the form someMethod("keyvalue"). I have been using the MVEL dialect and do not see a way to call a function with arguments on the LHS side of a rule either in the documentation or the mailing list. In fact, I have been trying something like rule "rulename" agenda-group "evaluation" when $d: VO( computePrice("key") < 10) from entry-point "Inventory stream" then # end This fails with a 'no viable alternative at input '"key"' in rule. Is there a way this can be accomplished? Thanks, Vidya