How to downgrade a OBI RPD Version ?

....\bifoundation\server\bin>nqgenoldverrpd.exe -P <repository-password> -I <source-rpd-location> -O <target-rpd-location> -V <target-version-number>

Example:

....\bifoundation\server\bin>nqgenoldverrpd.exe -P admin123 -I C;\MySource.rpd -O C:\MyTarget.rpd -V 318