SOLUTION MANAGER- alert doesn't exist or not accesible now

I execute transaction solution_manager and I chose productive system in the User defined Alert I created alert "Erroneous Fax & e-Mail (client 300)" and I copy in the Alert long name MTE name which I obtained form rz20 source monitoring system and ... so on

It sould work but in one system I received "alert doesn't exist or not accesible now"

Can somebody help

Thanks