Compound assignment operation like BigDecimal_type_property += BigDecimal_value causes a compilation error in executable model. ------------------------------------------------------------------------------------------------------------------------------- Key: DROOLS-5895 URL: https://issues.redhat.com/browse/DROOLS-5895 Project: Drools Issue Type: Bug Components: executable model Reporter: Luca Molteni Assignee: Luca Molteni Priority: Major Labels: support Compiling a rule like (*1) which is described in MVEL dialect and uses a compound assignment operation like _BigDecimal_type_property_ += _BigDecimal_value_, for example, - $bus.weight += $bus.weight; ..... (6c) or - BigDecimal bd1 = 1000; $bus.weight += bd1; ..... (6d) with executable rule models enabled, an error like (*2) occurs. $bus.weight is a BigDecimal type property. The same issue also occurs in the case of using '-='. For '*=' and '/=', no compilation error occurs but the value of $bus.weight does not change by the operation. (*1) {noformat} package com.example.reproducer import com.example.reproducer.Bus dialect "mvel" rule "bus6c" when $bus : Bus() then $bus.weight += $bus.weight; ..... (6c) System.out.println("***** " + $bus + ", weight = " + $bus.weight); update($bus); end {noformat} (*2) {noformat} [ERROR] /work2/cases/02801729/reproducer_02801729_6c_6d/target/generated-sources/drools-model-compiler/main/java/com/example/reproducer/PF9/LambdaConsequenceF9B783ABDBE8B65F49FDA13227908E7F.java:[19,56] void cannot be dereferenced {noformat}