I entered 2022 first 2 months contribution, just $200 over my 2021 RRSP contribution room, then I got the same warning to stop transmit my claim 2021 income tax online to CRA. If I tried to remover the extra $200 from my total contribution in the first 2 months of this year, then it is ok to send electronically.
IT IS DEFINITELY A BUG IN YOUR SOFTWARE!!!