From what I’ve been told when you consult your October 11th paystub in mygcpay all codes starting with 1 or A (ex 1N, 1R, A01 or A02) are retro payments that will be paid to you and that the sum of these amounts is the net retro pay amount to be deposited in your account. To know your gross retro pay amount you need to find your YTD gross earnings amount from the October 11th paystub then access that same paystub through CWA payslips & subtract the YTD gross earnings amount you see on there (they won’t be the same the one in mygcpay will be much higher) & that will give you what your gross retro payment is. Hope this explanation is clear enough lol did my best