Locked packages / diagrams after svn commit

[nora]

I'm using the professionel edition. After commiting successfully my diagram to the svn repository my diagram is marked with alittle key icon. Editing of the diagram is the n no longer possible. The professional edition does not provide security so i do not have the option path:
project -> security
or right-click on diagram -> Unlock diagram
How can i release the lock?

[Eve]

You need to have your package checked out in order to edit.  (EA operates under and exclusive lock system.)

[OwenInCanada]

For example, right-click on the package in the Project browser and select Package Control | Checkout...