grp.checkwrite

[CristianAgata]

Good evening,
I have a doubt, I always use checkwrite with the command feedback, here an example:

stato_int = grp.getvalue('cmd_1')
luce_1 = grp.getvalue('luce_1')

if luce_1 == true then
  grp.checkwrite( 'cmd_1' , 1 ,1, stato_int)
  else
  grp.checkwrite( 'cmd_1' , 0,1 , stato_int)
end

And this works fine. 
Problem, on a plant I don't know why, some time I found the command on but status off so I tought to pass the status but it doesn't work. Where m'I wrong?

stato_int = grp.getvalue('Status_cmd_1')
luce_1 = grp.getvalue('luce_1')

if luce_1 == true then
  grp.checkwrite( 'cmd_1' , 1 ,1, stato_int)
  else
  grp.checkwrite( 'cmd_1' , 0,1 , stato_int)
end

Best regards Cristian