I'm using grid-based phase battles with Move as the default action, exactly like in the Mission Grid Battles demo. Now, I made an Ability that's not targeting a specific combatant, but rather a grid cell. So, in Target Settings, I use:
Target Type: All
Target Range: None
Select Target Cell: True
And then, I use a Use Range Setting with a template that allows the user to select one of two cells on each side of his character.
The position of the selected cell is then used in a function called from a Call Function node in a Battle animation.
When I select this Ability in-game, I can choose the cell and everything works fine. However, if I choose to cancel the Ability while in cell-selection mode, then it cancels the Move action as well. Since I have no Move button (it's the default action), the user can no more move his character.
What's interesting is that this ability is the only one that has a problem with cancelling. If I cancel an attack action that target real combatants (instead of a cell), the Move action is NOT cancelled.
I worked around this issue by unchecking Allow Cancel from Battle Grid Settings/Target Cell Selection, but I'd really like to make it possible for the user to cancel at the Target Selection stage.