AFAIK the 1235 cannot be set to bank rec and you can't change it either. I wrote a little tool to change it, so I too would like to know the fix that doesn't need a tool.
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I don't have access to the computer that this problem was on at the moment, but
if I remember correctly I changed the cash register account to a different number (one that we have never used)
and then having done that I was able to uncheck the box in 1235 which was saying no Bank reconciliation.
I will try to remember to see if I can work out what I did when I have access to the client;s computer again,
in case that's not what I did at all!