Since svn status doesn't return information, you don't have any edited files in your working copy.
Steal the lock on the file that contains the package (if you're not sure about the file name and location, you can look it up here: right-click on the package in EA, Package Control, Configure...):
- if you're using TortoiseSVN: Get Lock..., and mark checkbox Steal the locks (http://tortoisesvn.net/docs/nightly/TortoiseSVN_en/tsvn-dug-locking.html)
- if you're using svn: svn lock --force (http://svnbook.red-bean.com/en/1.7/svn.ref.svn.c.lock.html)
Then unlock the file again, and check out the package in Enterprise Architect.