Anyone knows how to use variables (from fields) setted on LHS, to modify a field on the RHS using the GUI editor from BRMS? What I need is to write this rule on BRMS. rule "Set approvedMount for a women" no-loop true when $p: Person($sex: sex == "F", $income: incomeMount) then $p.setApprovedMount($income * 1.2); update($p); end I know I can use formulas, but I only know how to set those on LHS, I dont know how to put a formula on RHS (setter of the field to modify). Thanks. Felipe Piccolini M. felipe.piccolini(a)bluesoft.cl