After choosing "yes" to the dialog box below (invoked in a part file when using Insert>Features>Save Bodies...)

I now want to try the second ("No") option. This came up after converting to a new origin coordinate system, not from changing "units". I'm suspecting my few added "Custom Properties" containing coordinates to the center of mass of some objects are at issue, because their distance to the origin would change. Am I wrong here? How can I get the second option to be invoked again if I'm right?