Learn how easy it is to sync an existing GitHub or Google Code repo to a SourceForge project! See Demo
== Test case ==
Create a sales order.
Add some lines to it.
Go to header and complete it.
Now you will see that the "Lines" tab is grey and you can not navigate to it.
Workaround: after you complete the document you can hit "refresh" button and the Lines tab will not be grey anymore.