To retrieve a previous version, you have to use “revert” command. But revert command will simply
erase local edits, what you actually need is to “merge” command. For example, you have a file
[abc.txt] and the current version is 101, and you want version 201. Then you will use the
command like
svn merge –r 101:201 abc.txt
svn commit –m “Reverted to revision 201” abc.txt