Inheritance of form schema hints, not working

[volkerjaenisch]

Let's assume a simple case:

class IEmailAddress(model.Schema):

    read_permission(  check_spam='inqbus.mc.emailaddress.read_check_spam' )
    write_permission( check_spam='inqbus.mc.emailaddress.write_check_spam' )
    check_spam = schema.Bool(default=True,
                             title=_("check spam"),
                             required=False,
                             )

class ISpecialEmailAddress(IEmailAddress)

    check_virus = schema.Bool(default=True,
                             title=_("check virus"),
                             required=False,
                             )

The permissions set on the field "check_spam" are working perfectly on forms utilizing IEmailAddress but not on forms utilizing ISpecialEmailAddress.

Also please have a look on the ongoing discussion of this topic:
https://community.plone.org/t/inheritance-of-form-schema-hints/2388