that's always like this with software

only the admin should define for whitch number A the user B is allowed to set a cfu.

the user B get a description with the number he is allowed to set a cfu and the field to set the diversion (perhaps exacly the same layout as in the profile for setting a cfu).

in our case number A isn't a real user. could also be a wq. the goal is, that somone can set the target number for a specific number A.

Regards

Marc