Hi Boguslaw,
A BO instance is needed to call the BOAction.
In you second screenshot, you select Root in Instance Binding.
You button is disabled because there is no instance.
Options:
1) you can select DataList (OWL table) instead of Root in Instance Binding
then, the button will be enabled when you select a row (instance) on the table
2) if you want to perform BOAction on every instance (e.g delete every instance)
you can select Root in Instance Binding, but you need to create a dummy instance before calling the BOAction. Like this:
a) BOOperation -> Create
b) BOAction -> Instancing Binding with Root
Note : You need to delete the dummy instance back. You can add this.Delete() in the BOAction.
Best Regards,
Fred