You tried to place a Plant Schedule with the Spacing option checked for one or more of your plant types (example: Shrubs).
When you placed the Plant Schedule, it did not include a colum for the Spacing option for this plant type – even though you're positive that the option was checked when you placed the schedule.
This is a known issue we've seen occurring when the Spacing option is checked in the Plant Schedule default settings.
We are currently working to find a solution to this issue. For now, you can use the following workaround:
3. In the Plant Schedule dialog box, uncheck the Spacing option for the plant type(s) for which you're trying to show the spacing.
4. Check the Spacing option for that plant type again.
Click OK to place the schedule.
The Plant Schedule should now include the Spacing option for the plant type(s) where you've selected it.