How to turn via merging off

Hi,

Is it possible to turn off via mering?

For example I have a 12 layer board. If I place a via from 5:7 and place one from 7:9 on it, it merges them together to 5:9. I don't want them to merge, so I can move both via's on their own.

I've tried changing the Pad-Pad Connect setting, but it won't change anything. THe via's are still merging.

Using:

• OrCAD PCB Designer Professional 16.6-2015 S072
• Windows 7 Professional 64-bit

Regards,

Michiel