* Copy your custom code library from your old DB to the new one.
* If a class cannot be found, please make sure it doesn't have the namespace "System".
Also, some method signatures have changed, so we have to adapt custom code if these methods are used:
If you're stuck, please ask a developer.
[[Category:How-To|Transfer Data from 3.7 to 4.0]]
[[Category:Install|Transfer Data from 3.7 to 4.0]]
[[Category:Installing|Transfer Data from 3.7 to 4.0]]
[[Category:Server|Transfer Data from 3.7 to 4.0]]
[[Category:Version 4.0|Transfer Data from 3.7 to 4.0]]
== Optional: Maintain system object customizing ==