To Resolve an Issue Discovered During the Validation

If you need to upgrade an MYOB Advanced instance in the production environment, if the validation of the compatibility of the code included in all currently published customization projects with the code of the new product version fails, do the following:
Note: The validation that detects breaking changes is by default turned on in an instance of MYOB Advanced. If you need to temporarily omit this validation, you can turn off the CheckCustomizationCompatibility key by including the following string in the <appSettings> section of the web.config file located in the website folder:
<add key="CheckCustomizationCompatibility" value="False" />
We do not recommend that you turn off the validation permanently.