[Health] Cannot rename/delete product

[Leonardo M . Ramé]

Hi, doing my first steps with GNU Health and Tryton and got stuck at 
trying to rename the default products.

When I go to Products -> Products I get this list:

Ultrasound charges
MRI charges
X-ray charges
CT Scan charges
PET Scan charges

Now I want to rename those to my language (Spanish) by double clicking 
on any of them, changing the name and clicking on the Disk Drive on the 
toolbar (Save this record), but I get this error message:

"No está autorizado para modificar este registro.
Este registro es parte de la configuración base."

How can I modify/delete those products?.

Regards,
--
Leonardo M. Ramé
InformeMedico.com.ar
Tel.: +54 9 (0351) 6629292