Added supplier menuitem under Party menu.

__init__.py

@@ -25,3 +25,4 @@
 ##############################################################################
 
 from purchase import *
+from party import *

__tryton__.py

@@ -20,5 +20,6 @@
     ],
     'xml': [
         'purchase.xml',
+        'party.xml',
     ],
 }

party.py

@@ -0,0 +1,40 @@
+from trytond.wizard import Wizard
+
+class OpenSupplier(Wizard):
+    'Open Suppliers'
+    _name = 'relationship.party.open_supplier'
+    states = {
+        'init': {
+            'result': {
+                'type': 'action',
+                'action': '_action_open',
+                'state': 'end',
+            },
+        },
+    }
+
+    def _action_open(self, cursor, user, datas, context=None):
+        model_data_obj = self.pool.get('ir.model.data')
+        act_window_obj = self.pool.get('ir.action.act_window')
+
+        model_data_ids = model_data_obj.search(cursor, user, [
+                ('fs_id', '=', 'act_party_form'),
+                ('module', '=', 'relationship'),
+                ], limit=1, context=context)
+        model_data = model_data_obj.browse(cursor, user, model_data_ids[0],
+                                           context=context)
+        res = act_window_obj.read(cursor, user, model_data.db_id,
+                                  context=context)
+        cursor.execute(
+            "SELECT party, max(purchase_date) FROM purchase_purchase "\
+                "GROUP BY party "\
+                "ORDER BY max(purchase_date) DESC"
+            )
+        suppliers = [line[0] for line in cursor.fetchall()]
+
+        domain = eval( res.get('domain') or "[]" )
+        domain.append(('id', 'in', suppliers))
+        res['domain'] = str(domain)
+        return res
+
+OpenSupplier()

party.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0"?>
+<tryton>
+    <data>
+        <record model="ir.action.wizard" id="act_open_supplier">
+            <field name="name">Active Suppliers</field>
+            <field name="wiz_name">relationship.party.open_supplier</field>
+        </record>
+        <record model="ir.action.keyword" id="act_open_supplier_keyword1">
+            <field name="action" ref="act_open_supplier"/>
+            <field name="keyword">form_action</field>
+            <field name="model">relationship.party,0</field>
+        </record>
+        <menuitem name="Suppliers"
+            parent="relationship.menu_party_form"
+            action="act_open_supplier"
+            type="wizard"
+            icon="STOCK_JUSTIFY_FILL"
+            id="menu_open_supplier"/>
+    </data>
+</tryton>