Aha...you are playing with misrepresentation.
This exactly happened to me. After submitting my application on the 26th Oct, I noticed my IMM 5669- Schedule A form and noticed that same error- for myself and wifey.
I ran everywhere seeking for directions and advice- some said I shouldn't bother that they won't notice the error, some where as confused as I was.
I finally decided within me to correct the form (myself and wifey) scan and send with a letter of explanation on the error, regretting the oversight. I submitted it to
immigration.documents@gov.sk.ca on the 28th and just hoped for the best.
I got confirmation that my email has been received and weeks later, I noticed that the schedule A form has been replaced on OASIS with the corrected one on the 8th of November
I got ADR for other documents on the 12th of Nov and my corrected Schedule A form was never mentioned in the ADR note.
I wish you all the best as the SINP of this period is becoming so strict and looking for all means to slam people rejection note.
(To think that SINP sent someone in our whatsapp group request to explain who owns the credit card he used to make payment for his application submission. So ridiculous I'd say!)