Security for PC10.1 form?

Is it possible to secure Lawson form PC10.1, Patient Charge Items?

I have lines restricting the user access by company, but the user can still access other companies' data.  They cannot see the other company data in the drop down, but if the correct combination of company and Revenue center code is entered, the user has access to the data.  Because we are adding Add, Delete, and Change to a basic child security class we want this form secure.

We are on 8.0.03 using Windows and UNIX AIX.

Thanks,
Sherry