problem deleting graph in template

[llachevre]

hi all,

yesterday i created a graph in a Template
this graph has spread to many hosts but 10 minutes later i want to delete it from the Template ==> it's ok
the problem is that graph is still in every hosts and i can't delete it from host, it is grayed out !!!
a message appears at the bottom : No graph item with graphid xxxxx

someone can help me please ?

thx a lot

see you