In texts read out earlier at the hearing, a former staffer to Dominic Perrottet and other federal Liberal MPs, now-lobbyist Christian Ellis, told Jean-Claude Perrottet to include tax in invoices. I just asked Rob how I do invoice," replied Jean-Claude Perrottet, who had aspirations of joining the finance industry at the time. Jean-Claude Perrottet vehemently denied Ms Curtin's suggestions he was carrying out factional work and being paid by various entities. "Don't put that in writing," Mr Perrottet replied, to which Mr Greenwood assured him "it deletes". (Dan Himbrechts/AAP PHOTOS)Questioned about this exchange, Jean-Claude Perrottet chalked up the language used as a joke, saying he was having a "crack" at him.