[rules-users] Get instance from working memory and update it in the flow

Hi, I need to update an instance from the working memory in my Action/Script node in process flow. I have an instance in the working memory which I updating inside my rules, furthermoreת I need to update it inside my action node. Is there an option to retrieve this object instance during the flow? I have a constrain at the beginning of the flow which filter out all other instances of this object and leaves only the relevant instance. I am using the context.getVariable("instName") and context.setVariable("instName", object), but my problem is to get the specific instance because the constrain component doesnt allow me to use the setVariable... Thanks Yaniv