diff --git a/odoo/addons/test_access_rights/models.py b/odoo/addons/test_access_rights/models.py
index 1ce608325f7..52eee53979a 100644
--- a/odoo/addons/test_access_rights/models.py
+++ b/odoo/addons/test_access_rights/models.py
@@ -51,3 +51,18 @@ class FakeTicket(models.Model):
 
     name = fields.Char()
     message_partner_ids = fields.Many2many(comodel_name='res.partner')
+
+
+class ResPartner(models.Model):
+    """User inherits partner, so we are implicitly adding these fields to User
+       This essentially reproduces the (sad) situation introduced by account.
+    """
+    _name = 'res.partner'
+    _inherit = 'res.partner'
+
+    currency_id = fields.Many2one('res.currency', compute='_get_company_currency', readonly=True)
+    monetary = fields.Monetary()  # implicitly depends on currency_id as currency_field
+
+    def _get_company_currency(self):
+        for partner in self:
+            partner.currency_id = partner.sudo().company_id.currency_id
\ No newline at end of file
diff --git a/odoo/addons/test_access_rights/tests/__init__.py b/odoo/addons/test_access_rights/tests/__init__.py
index 1e05ba54c86..3ae99ca28b4 100644
--- a/odoo/addons/test_access_rights/tests/__init__.py
+++ b/odoo/addons/test_access_rights/tests/__init__.py
@@ -1,3 +1,4 @@
 from . import test_ir_rules
 from . import test_feedback
 from . import test_check_access
+from . import test_access_monetary_related
diff --git a/odoo/addons/test_access_rights/tests/test_access_monetary_related.py b/odoo/addons/test_access_rights/tests/test_access_monetary_related.py
new file mode 100644
index 00000000000..176bf9a73bf
--- /dev/null
+++ b/odoo/addons/test_access_rights/tests/test_access_monetary_related.py
@@ -0,0 +1,36 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+import odoo.tests
+
+
+class TestMonetaryAccess(odoo.tests.HttpCase):
+
+    def test_monetary_access_create(self):
+        """Monetary fields that depend on compute/related currency
+           have never really been supported by the ORM.
+           However most currency fields are related.
+           This limitation can cause monetary fields to not be rounded,
+           as well as trigger spurious ACL errors.
+        """
+        user_admin = self.env.ref("base.user_admin")
+        user_demo = self.env.ref("base.user_demo").with_user(user_admin)
+
+        # this would raise without the fix introduced in this commit
+        new_user = user_demo.copy({'monetary': 1/3})
+
+        # The following is here to document how the ORM behaves, not really part of the test;
+        # in particular these specific points highlight the discrepancy between what is sent
+        # to the database and what we get on the ORM side.
+        # (to be fair, these are pre-existing ORM limitations that should have been avoided
+        # by using more careful field definitions and testing)
+        self.assertEqual(new_user.currency_id.id, False,
+                         "The cache contains the wrong value for currency.")
+        self.assertEqual(new_user.monetary, 1/3,
+                         "Because of previous point, no rounding was done.")
+
+        new_user.invalidate_cache()
+
+        self.assertEqual(new_user.currency_id.rounding, 0.01,
+                         "We now get the correct currency.")
+        self.assertEqual(new_user.monetary, 0.33,
+                         "The value was rounded when added to the cache.")
diff --git a/odoo/fields.py b/odoo/fields.py
index f244eb56163..720c3bcb7c0 100644
--- a/odoo/fields.py
+++ b/odoo/fields.py
@@ -1340,7 +1340,7 @@ class Monetary(Field):
     def convert_to_cache(self, value, record, validate=True):
         # cache format: float
         value = float(value or 0.0)
-        if validate and record[self.currency_field]:
+        if validate and record.sudo()[self.currency_field]:
             # FIXME @rco-odoo: currency may not be already initialized if it is
             # a function or related field!
             value = record[self.currency_field].round(value)