Fields unicity and Plugin Additional fields

Include in the Fields unicity of an object, fields of the plugin additional fields:

**Additional field on Computer:**


**Fields unicity on Computer:**

**We can't add the field 'Nombre máquina virtual' like Fields unicity.**


In such a way that even though these fields reside in different tables from the behavior in the GLPI interface they behave as if they were fields of the same table.