In order to find out whether Store Manager will work with your store shopping cart you can run the databases compatibility testing . Go to the Tools section and click on 'Database Compatibility Test' option.
The database will be compared with the standard osCommerce base and result of verification displays in the dialog window. You can check the critical errors and warnings.
This testing is useful also when you would like to install the some third-party solutions in your software but are not sure whether these solutions will be work.
If you get errors, please check the database fields to fix them, provided that you know how to do this.