New transaction - require variant selection to be disabled

hi all

I have created a new report transaction which runs an existing custom program of ours, with a specific variant which greys out most of the fields in the transaction (this is for the sake of security as the program is normally only ever run by a day end batch job).

However, when running the transaction, the user can simply change the variant to an existing one where the fields are not greyed out!

Is there any way within the transaction definition of "locking" the start variant so it cannot be changed?

Thanks

Jon