How check the user roles in Business Partner edition screen?

Hello Masters,

I'm having a little problem figuring out how to check the user roles to allow modification in some fields.

At the 'Manage Organizational Data' screen ('Manage Business Partners' -> Business Partner Data -> edit). I need to check the user roles to let him change the 'Tax Numbers' values. The values can be changed only if the user is a administrator; otherwise it must only show the value.

I checked the HTML Template and found where I can restrict this edition option, but the problem is that I don't know how to check the user roles here. Maybe there is a function to do this?

Any ideas of how I can do it? Is there any magical BAdI to check this?

Thanks in advance,

José Omar