title: How to rollback 1 file, make some changes, and push commit into the newest?
body: <p>I noticed that I made a lot of error in one of my app.css file.
  I am currently on r20.</p>
  
  <p>I have used a rollback command:
  svn up -r 10 src/main/webapp/css/app.css</p>
  
  <p>I added a lot of code in and fixes the problem.
  How do I push this commit into r21?
  I have try committing by doing svn commit but getting error : "src/main/webapp/css/app.css' is out of date"</p>
  
  <p>I want to push this file</p>