Email does not have to be unique.

Multiple Person can come from different sources (FB, G+, BID, ...) and they
can have same email.

master/bt5/vifib_erp5/PropertySheetTemplateItem/portal_property_sheets/VifibEmailConstraint/email_unicity_constraint.xml

-<?xml version="1.0"?>
-<ZopeData>
-  <record id="1" aka="AAAAAAAAAAE=">
-    <pickle>
-      <global name="Attribute Unicity Constraint" module="erp5.portal_type"/>
-    </pickle>
-    <pickle>
-      <dictionary>
-        <item>
-            <key> <string>_identity_criterion</string> </key>
-            <value>
-              <persistent> <string encoding="base64">AAAAAAAAAAI=</string> </persistent>
-            </value>
-        </item>
-        <item>
-            <key> <string>_range_criterion</string> </key>
-            <value>
-              <persistent> <string encoding="base64">AAAAAAAAAAM=</string> </persistent>
-            </value>
-        </item>
-        <item>
-            <key> <string>constraint_property</string> </key>
-            <value>
-              <tuple/>
-            </value>
-        </item>
-        <item>
-            <key> <string>description</string> </key>
-            <value>
-              <none/>
-            </value>
-        </item>
-        <item>
-            <key> <string>filter_parameter</string> </key>
-            <value> <string>python: {\'portal_type\': object.getPortalType(), \'url_string\': object.asText(), \'parent_portal_type\': object.getParentValue().getPortalType()}</string> </value>
-        </item>
-        <item>
-            <key> <string>id</string> </key>
-            <value> <string>email_unicity_constraint</string> </value>
-        </item>
-        <item>
-            <key> <string>int_index</string> </key>
-            <value>
-              <none/>
-            </value>
-        </item>
-        <item>
-            <key> <string>membership_criterion_category</string> </key>
-            <value>
-              <tuple/>
-            </value>
-        </item>
-        <item>
-            <key> <string>message_invalid_attribute_unicity</string> </key>
-            <value> <string>Email must be unique</string> </value>
-        </item>
-        <item>
-            <key> <string>portal_type</string> </key>
-            <value> <string>Attribute Unicity Constraint</string> </value>
-        </item>
-        <item>
-            <key> <string>string_index</string> </key>
-            <value>
-              <none/>
-            </value>
-        </item>
-        <item>
-            <key> <string>test_method_id</string> </key>
-            <value>
-              <tuple/>
-            </value>
-        </item>
-        <item>
-            <key> <string>test_tales_expression</string> </key>
-            <value> <string>python: object.getCoordinateText("") != "" and context.getValidationState() != \'cancelled\'</string> </value>
-        </item>
-      </dictionary>
-    </pickle>
-  </record>
-  <record id="2" aka="AAAAAAAAAAI=">
-    <pickle>
-      <global name="PersistentMapping" module="Persistence.mapping"/>
-    </pickle>
-    <pickle>
-      <dictionary>
-        <item>
-            <key> <string>data</string> </key>
-            <value>
-              <dictionary/>
-            </value>
-        </item>
-      </dictionary>
-    </pickle>
-  </record>
-  <record id="3" aka="AAAAAAAAAAM=">
-    <pickle>
-      <global name="PersistentMapping" module="Persistence.mapping"/>
-    </pickle>
-    <pickle>
-      <dictionary>
-        <item>
-            <key> <string>data</string> </key>
-            <value>
-              <dictionary/>
-            </value>
-        </item>
-      </dictionary>
-    </pickle>
-  </record>
-</ZopeData>

master/bt5/vifib_erp5/bt/revision

-445
+446
\ No newline at end of file