Audio Sync - Warning: Clips with mismatched edit rates will not be auto synced.

Hi all, title says it all really. Production recorded their in video in 23.97fps and audio is 25fps. Project is 25fps and this error is being thrown up every time I try auto-sync. I've tried with in points, waveform and timecode.

I've also tried converting the video playback rates to match, changing audio playback rates and trying with different Avid project settings.

I can't find a definitive answer anywhere. Has anybody else experienced this problem before? Are there any alternatives for syncing audio?