Our previous accountant used sage tax report for GST/QST remittance, so there is always a balance in the beginning of period.

When I reported for Jul-Sep/2020, I cleared all the beginning balance, which included GST/QST to pay amount for period of Jul-Sep/2019, and I paid all in Oct-2020.

But in November, I received a notice from Revenue Quebec, asked me to pay a QST amount plus some interest, and at that time I could not figure out why and I sent a check before due to avoid penalty, but later on I called them and knew it was for period of Jul-Sep/2019 !

I did the payment under Vendor Revenue Quebec:     

Dr. 5900 Suspense   

    Cr. cash bank  

How should I allocate this Dr. 5900 Suspense   and  I need claim back this double-paid GST/QST  ?

Please help. Thanks.