Did you need this position and the 7 months of work history for the points you claimed under CRS? If so, you have a responsibility to provide as much information as possible to IRCC so they can verify your employment and whether the job description matches your self-identified NOC. If this position was not required for CRS points, I would have not brought it up at the ITA stage or, later, would have removed it with an LOE at the AOR stage. Please elaborate. Now that you have reported this position and you are post-AOR, IRCC can demand further evidence. Some people who are unable to provide all of the supporting documents usually send in some combination of pay stubs, photos of yourself at the workplace, testimonials by the clients you served, letters confirming your employment by your coworkers, etc. (and the list goes on)