Sometimes we have an update of codebase many files updates also new files to be added and also removed, to overcome this issue you will need to add them or remove them without adding/removing files already exsits in the repo, the following command line script solve this issue.
svn st | grep ^? | sed 's/? //' | xargs svn add
svn st | grep ^! | sed 's/! //' | xargs svn rm