I made a template that had key 1 as the camera chroma key, bkgd was harris video server (or your video source) - then in the coding you have the VO code then your chroma key code to play the vo at the wall - then you code your next VO with your vo coding and it will wipe just fine. I did not have a problem wiping off the key to another video source.
If you want to wipe in the key form VO to another cross point - then in your template make the PST set crosspoint - and you could go from video to a sky cam shot with talent in front of both sources at the key wall.
#OverDrive