framework must not accept xml-rpc to write into function fields

[Ferdinand]

6.1 this statement "works"

reason: if a field becomes a stored function field (during upgrade, module install ...) - any remote "already working" application writing values using xml-rpc will continue to write and succeed without notification that the values are NOT written any more, because the function fields gets updated and stored with the correct value.

after executing this statement the value of complete_name = "New CRM" even though the application has written "100".

***************************** Test case ************************
import xmlrpclib

username = 'demo' #the user
pwd = 'demo' #the password of the user
dbname = 'demo' #the database

# Get the uid
sock_common = xmlrpclib.ServerProxy ('http://localhost:8069/xmlrpc/common')
uid = sock_common.login(dbname, username, pwd)

#replace localhost with the address of the server
sock = xmlrpclib.ServerProxy('http://localhost:8069/xmlrpc/object')

crm = {
   'name': 'New CRM',
   'complete_name' : 100,
}

crm_id = sock.execute(dbname, uid, pwd, 'crm.case.section', 'create', crm)

print crm_id
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