Mouserover BR Macro & Grid

[Basso]

I tried this two Macros if im clicking on a corpse the work but they wont work if i click
on their frame in Grid, tried it yesterday serveral times on Lei Shen HC, does anyone
of you know where my mistake is?

/cast [@mouseover] Raise Ally

/cast [target=mouseover] Raise Ally

The skill is binded on the middle mouse button if i click somewhere on my screen i get at least an error message, that i have no target and so on, clicking on grid doesnt give a feedback at all, i can hit the button as long as i want but nothing happens, no rezz, no error message nothing.