Stop direct access to FB01 but should be accessible through FF_5

Hi Experts,

Is it possible to stop
direct access of FB01 to user but at the same time when FB01 is called through
another transaction like FF_5 then it  should be accessible. While
uploading the bank statement through FF_5 transaction code it goes through the
FB01. So when the FB01 is removed from role the bank statement cannot be
uploaded. We do not want to give direct access of FB01 to user but at the same
time bank statement should be uploaded from FF_5.

Thanks in Advance