helper def : lastNode : tc463!NodeType = OclUndefined;

rule Step{
	from
		step : tc50!Step
	to
		node : tc463!NodeType(
			transition <- transition463
		),
		transition463 : tc463!TransitionType(
			x <- step50.x;
		)
	do{
                if(thisModule.lastNode.oclIsUndefined()){
			thisModule.lastNode <- node463;
		}else{
			if(thisModule.lastNode.id = node463.id){
				thisModule.lastNode.transition <- node463.transition;
				--I have to delete node463 here
			}else{
				thisModule.lastNode <- node463;
			}
		}
        }
}