Sage 50 Canada

I have a supplier with a credit balance when it should be zero. There was an invoice posted that got reversed, however the credit is lingering on the supplier record. When I run the aged detail report and then try to drill into the CN, I get an error…

We have a company that we buy lab supplies and also have a service contract. Since it's the same company, I have to remember to change the account when I post the Service Contract which I forgot twice. One is posted in the previous year (15/01/2015…