Drop not needed constraint.

Such assertion is already provided by
slapos_assert_hosting_subscription_predecessor alarm.

master/bt5/slapos_cloud/PropertySheetTemplateItem/portal_property_sheets/SlaposHostingSubscriptionConstraint/predecessor_constraint.xml

-<?xml version="1.0"?>
-<ZopeData>
-  <record id="1" aka="AAAAAAAAAAE=">
-    <pickle>
-      <global name="Category Membership Arity 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_base_category</string> </key>
-            <value>
-              <tuple>
-                <string>predecessor</string>
-              </tuple>
-            </value>
-        </item>
-        <item>
-            <key> <string>constraint_portal_type</string> </key>
-            <value> <string>python: (\'Software Instance\', \'Slave Instance\')</string> </value>
-        </item>
-        <item>
-            <key> <string>description</string> </key>
-            <value>
-              <none/>
-            </value>
-        </item>
-        <item>
-            <key> <string>id</string> </key>
-            <value> <string>predecessor_constraint</string> </value>
-        </item>
-        <item>
-            <key> <string>int_index</string> </key>
-            <value>
-              <none/>
-            </value>
-        </item>
-        <item>
-            <key> <string>max_arity</string> </key>
-            <value>
-              <none/>
-            </value>
-        </item>
-        <item>
-            <key> <string>membership_criterion_category</string> </key>
-            <value>
-              <tuple/>
-            </value>
-        </item>
-        <item>
-            <key> <string>min_arity</string> </key>
-            <value> <int>0</int> </value>
-        </item>
-        <item>
-            <key> <string>portal_type</string> </key>
-            <value> <string>Category Membership Arity 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: here.getSlapState() != \'draft\'</string> </value>
-        </item>
-        <item>
-            <key> <string>use_acquisition</string> </key>
-            <value> <int>0</int> </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/slapos_cloud/TestTemplateItem/testSlapOSCoreConstraint.py

@@ -397,43 +397,6 @@ class TestSlapOSHostingSubscriptionConstraint(TestSlapOSConstraintMixin):
         'start_requested')
     self._test_property_existence(property_id, consistency_message)
 
-  def test_predecessor_related(self):
-    self.portal.portal_workflow._jumpToStateFor(self.software_instance,
-        'start_requested')
-    software_instance2 = self.portal.software_instance_module.newContent(
-      portal_type='Software Instance')
-    software_instance3 = self.portal.software_instance_module.newContent(
-      portal_type='Software Instance')
-
-    self.software_instance.setPredecessor(software_instance2.getRelativeUrl())
-
-    # fetch basic list of consistency messages
-    current_message_list = getMessageList(self.software_instance)
-
-    consistency_message = "Arity Error for Relation ['predecessor'], arity is "\
-        "equal to 0 but should be at least 1"
-
-    # test the test: no expected message found
-    self.assertFalse(consistency_message in current_message_list)
-
-    # 0 is bad
-    self.software_instance.setPredecessor(None)
-    self.assertTrue(consistency_message in getMessageList(self.software_instance))
-    # Note: There is (nonsense) constraint
-    # SlaposHostingSubscriptionConstraint/predecessor_constraint which
-    # defines minimum as 0, thats why this test will fail
-
-    # one is good
-    self.software_instance.edit(predecessor=software_instance2.getRelativeUrl())
-    self.assertFalse(consistency_message in getMessageList(self.software_instance))
-    self.assertSameSet(current_message_list, getMessageList(self.software_instance))
-
-    # more then one is good
-    self.software_instance.edit(predecessor_list=[software_instance2.getRelativeUrl(),
-        software_instance3.getRelativeUrl()])
-    self.assertFalse(consistency_message in getMessageList(self.software_instance))
-    self.assertSameSet(current_message_list, getMessageList(self.software_instance))
-
 class TestSlapOSPersonConstraint(testSlapOSMixin):
 
   def test_role(self):

master/bt5/slapos_cloud/bt/revision

-232
\ No newline at end of file
+233
\ No newline at end of file