If you had a 30-day late, the OC will report this to the CRA under two separate field codes in your CR.
First, they report it to your "payment history profile," field code 18. This is a "sticky" code, meaning that when reported again next month, the prior month reporting is retained. Next month's reporting will add a new additional to this code, whch could be a 60-day late, or paid, for example. And so on and so on, month after month. That builds a retained payment history.
Second, they also report current account status under field code 17. That is not a "sticky" code. It does not revise your payment history. It just reports the current status. Subsequent updates to your account status code override the prior status code. So when you first have a 30-day late, they will report current status of 30-days past due. If you then paid it the next month, they will update the current status to paid in full.
Thus, current status is not a proper indication of the prior occurance of a 30-day late, and thus the scoring of your credit report.
Yes, they should have updated the current status code to paid, but I dont think this has any real impact on your credit scoring.
To remove the effect of the 30-day late, you would have to get the OC to revise their reporting of your payment history profile by way of a GW request.
I dont think that focus on current account status is the key factor on your scoring.
