As already mentioned every time a new role is created and saved without selecting the "Manual" checkbox, Openbravo automatically fills in all the forms in the Form Access tab.
Above means that the newly create role will have access to every Openbravo form.
Having said that, if the "Manual" checkbox is selected, it will be required to manually add a subset of forms which will be accesible for a given role, or it will be required to automatically add them by using the action process "Grant Access". This process will allow form access for a given Openbravo module or area such as Projects, Finance or Sales.
Editable Field checkbox defines if the accessible data in a form can be edited by the role or not.