No target selection when Use Battle Action step

I have an ability for which you must select an hex in the grid as the target. When I cast it by clicking on a Shortcut menu icon, I have the cell-selection stage and then the ability is cast properly. However, if I trigger the same ability from a battle event with a Use Battle Action step, then ORK seems to auto-select a cell and skip the cell-selection stage for the player. Is there a way to force ORK to ask the player for a cell?

Alternatively, I tried to use a Call Function step and trigger the ability from script:
new AbilityBMItem(combatant.Abilities.Get(AbilityID, null).Accepted(combatant);
This effectively does not skip the target cell selection but, if I hit the Cancel key to cancel the ability during cell-selection, then I can't move my combatant anymore when I click on a cell after...

So, I could make it work either with the Use Battle Action step or through code but none works right now. Any ideas?

Thanks!