Join Date: Jun 2012
Location: MEL, PER, PBO, occasionally ships, oil rigs and other places that no sane human being should ever find themselves
Programs: IHG RA, PC Plat, QF Plat/LTS
Posts: 804
I think the difference is between a membership year and a calendar year.
For example, my membership year is Mar-Feb so (assuming the certificates were within their expiries) I could use "last year's" referral in early Feb and then "this year's" in late march. I would have referred two people in about a 45 day period within the same calendar year but in different membership years.